changed sig* to *_tilde

#if MSC_VER is obsolete
replaced all float by t_float

svn path=/trunk/externals/iemlib/; revision=6231

27 files changed, 4195 insertions, 145 deletions

diff --git a/src/iemlib1/FIR~.c b/src/iemlib1/FIR~.c
new file mode 100644
index 0000000..087190b
--- /dev/null
+++ b/src/iemlib1/FIR~.c
@@ -0,0 +1,169 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+
+#include "m_pd.h"
+#include "iemlib.h"
+
+
+/* ---------- FIR~ - FIR-filter with table-coef ----------- */
+
+typedef struct _FIR_tilde
+{
+  t_object  x_obj;
+  t_float   *x_coef_beg;
+  t_float   *x_history_beg;
+  int       x_rw_index;
+  int       x_fir_order;
+  t_symbol  *x_table_name;
+  t_float   x_msi;
+} t_FIR_tilde;
+
+t_class *FIR_tilde_class;
+
+static t_int *FIR_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_FIR_tilde *x = (t_FIR_tilde *)(w[3]);
+  int n = (t_int)(w[4]);
+  int rw_index = x->x_rw_index;
+  int i, j;
+  int order = x->x_fir_order;
+  int ord16 = order / 16;
+  t_float sum=0.0f;
+  t_float *coef = x->x_coef_beg;
+  t_float *write_hist1=x->x_history_beg;
+  t_float *write_hist2;
+  t_float *read_hist;
+  t_float *coef_vec;
+  t_float *hist_vec;
+  
+  if(!coef)
+    goto FIR_tildeperfzero;
+  
+  write_hist1 = x->x_history_beg;
+  write_hist2 = write_hist1 + order;
+  read_hist = write_hist2;
+  
+  for(i=0; i<n; i++)
+  {
+    write_hist1[rw_index] = in[i];
+    write_hist2[rw_index] = in[i];
+    
+    sum = 0.0f;
+    coef_vec = coef;
+    hist_vec = &read_hist[rw_index];
+    for(j=0; j<ord16; j++)
+    {
+      sum += coef_vec[0] * hist_vec[0];
+      sum += coef_vec[1] * hist_vec[-1];
+      sum += coef_vec[2] * hist_vec[-2];
+      sum += coef_vec[3] * hist_vec[-3];
+      sum += coef_vec[4] * hist_vec[-4];
+      sum += coef_vec[5] * hist_vec[-5];
+      sum += coef_vec[6] * hist_vec[-6];
+      sum += coef_vec[7] * hist_vec[-7];
+      sum += coef_vec[8] * hist_vec[-8];
+      sum += coef_vec[9] * hist_vec[-9];
+      sum += coef_vec[10] * hist_vec[-10];
+      sum += coef_vec[11] * hist_vec[-11];
+      sum += coef_vec[12] * hist_vec[-12];
+      sum += coef_vec[13] * hist_vec[-13];
+      sum += coef_vec[14] * hist_vec[-14];
+      sum += coef_vec[15] * hist_vec[-15];
+      coef_vec += 16;
+      hist_vec -= 16;
+    }
+    for(j=ord16*16; j<order; j++)
+    {
+      sum += coef[j] * read_hist[rw_index-j];
+    }
+    out[i] = sum;
+    
+    rw_index++;
+    if(rw_index >= order)
+      rw_index -= order;
+  }
+  
+  x->x_rw_index = rw_index;
+  return(w+5);
+  
+FIR_tildeperfzero:
+  
+  while(n--)
+    *out++ = 0.0f;
+  return(w+5);
+}
+
+void FIR_tilde_set(t_FIR_tilde *x, t_symbol *table_name, t_floatarg forder)
+{
+  t_garray *ga;
+  int table_size;
+  int order = (int)forder;
+  
+  x->x_table_name = table_name;
+  if(!(ga = (t_garray *)pd_findbyclass(x->x_table_name, garray_class)))
+  {
+    if(*table_name->s_name)
+      error("FIR~: %s: no such table~", x->x_table_name->s_name);
+    x->x_coef_beg = 0;
+  }
+  else if(!garray_getfloatarray(ga, &table_size, &x->x_coef_beg))
+  {
+    error("%s: bad template for FIR~", x->x_table_name->s_name);
+    x->x_coef_beg = 0;
+  }
+  else if(table_size < order)
+  {
+    error("FIR~: tablesize %d < order %d !!!!", table_size, order);
+    x->x_coef_beg = 0;
+  }
+  else
+    garray_usedindsp(ga);
+  x->x_rw_index = 0;
+  if(order > x->x_fir_order)/* resize */
+    x->x_history_beg =  (t_float *)resizebytes(x->x_history_beg, 2*x->x_fir_order*sizeof(t_float), 2*order*sizeof(float));
+  x->x_fir_order = order;
+}
+
+static void FIR_tilde_dsp(t_FIR_tilde *x, t_signal **sp)
+{
+  FIR_tilde_set(x, x->x_table_name, x->x_fir_order);
+  dsp_add(FIR_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void *FIR_tilde_new(t_symbol *ref, t_floatarg np)
+{
+  t_FIR_tilde *x = (t_FIR_tilde *)pd_new(FIR_tilde_class);
+  
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_msi = 0;
+  x->x_table_name = ref;
+  x->x_coef_beg = 0;
+  if((int)np < 1)
+    np = 1.0;
+  x->x_fir_order = (int)np;
+  x->x_history_beg = (t_float *)getbytes((2*x->x_fir_order)*sizeof(t_float));
+  x->x_rw_index = 0;
+  return(x);
+}
+
+static void FIR_tilde_free(t_FIR_tilde *x)
+{
+  if(x->x_history_beg)
+    freebytes(x->x_history_beg, (2*x->x_fir_order)*sizeof(t_float));
+}
+
+void FIR_tilde_setup(void)
+{
+  FIR_tilde_class = class_new(gensym("FIR~"), (t_newmethod)FIR_tilde_new,
+    (t_method)FIR_tilde_free, sizeof(t_FIR_tilde), 0, A_DEFSYM, A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(FIR_tilde_class, t_FIR_tilde, x_msi);
+  class_addmethod(FIR_tilde_class, (t_method)FIR_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(FIR_tilde_class, (t_method)FIR_tilde_set,
+    gensym("set"), A_SYMBOL, A_FLOAT, 0);
+  class_sethelpsymbol(FIR_tilde_class, gensym("iemhelp/help-FIR~"));
+}
diff --git a/src/iemlib1/biquad_freq_resp.c b/src/iemlib1/biquad_freq_resp.c
index f0c949c..bc1e99d 100644
--- a/src/iemlib1/biquad_freq_resp.c
+++ b/src/iemlib1/biquad_freq_resp.c
@@ -3,17 +3,10 @@
 
 iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
 
-#ifdef _MSC_VER
-#pragma warning( disable : 4244 )
-#pragma warning( disable : 4305 )
-#endif
-
 
 #include "m_pd.h"
 #include "iemlib.h"
 #include <math.h>
-#include <stdio.h>
-#include <string.h>
 
 /* ------------------------ biquad_freq_resp ------------------- */
 /* -- calculates the frequency responce of a biquad structure -- */
@@ -21,21 +14,21 @@ iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005
 typedef struct _biquad_freq_resp
 {
   t_object  x_obj;
-  float     a0;
-  float     a1;
-  float     a2;
-  float     b1;
-  float     b2;
+  t_float   a0;
+  t_float   a1;
+  t_float   a2;
+  t_float   b1;
+  t_float   b2;
   t_outlet  *x_out_re;
   t_outlet  *x_out_im;
 } t_biquad_freq_resp;
 
 static t_class *biquad_freq_resp_class;
 
-static void biquad_freq_resp_float(t_biquad_freq_resp *x, t_float f)
+static void biquad_freq_resp_float(t_biquad_freq_resp *x, t_floatarg f)
 {
-  float re1, im1, re2, im2;
-  float c, s, a;
+  t_float re1, im1, re2, im2;
+  t_float c, s, a;
   
   if(f < 0.0f)
     f = 0.0f;
diff --git a/src/iemlib1/db2v.c b/src/iemlib1/db2v.c
index e8b1db4..a2b075e 100644
--- a/src/iemlib1/db2v.c
+++ b/src/iemlib1/db2v.c
@@ -3,28 +3,21 @@
 
 iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
 
-#ifdef _MSC_VER
-#pragma warning( disable : 4244 )
-#pragma warning( disable : 4305 )
-#endif
-
 
 #include "m_pd.h"
 #include "iemlib.h"
 #include <math.h>
-#include <stdio.h>
-#include <string.h>
 
 /* -------- db2v - a techn. dB to rms-value converter. --------- */
 
 static t_class *db2v_class;
 
-float db2v(float f)
+t_float db2v(t_float f)
 {
   return (f <= -199.9 ? 0 : exp(0.11512925465 * f));
 }
 
-static void db2v_float(t_object *x, t_float f)
+static void db2v_float(t_object *x, t_floatarg f)
 {
   outlet_float(x->ob_outlet, db2v(f));
 }
diff --git a/src/iemlib1/f2note.c b/src/iemlib1/f2note.c
index 196fa6c..3625427 100644
--- a/src/iemlib1/f2note.c
+++ b/src/iemlib1/f2note.c
@@ -3,17 +3,10 @@
 
 iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
 
-#ifdef _MSC_VER
-#pragma warning( disable : 4244 )
-#pragma warning( disable : 4305 )
-#endif
-
 
 #include "m_pd.h"
 #include "iemlib.h"
 #include <math.h>
-#include <stdio.h>
-#include <string.h>
 
 /* ------------------------- f2note ---------------------- */
 /* ------ frequency to note plus cents converter --------- */
@@ -25,27 +18,27 @@ typedef struct _f2note
   void     *x_outlet_note;
   void     *x_outlet_cent;
   int      x_centomidi;
-  float    x_refhz;
-  float    x_refexp;
-  float    x_reflog;
+  t_float  x_refhz;
+  t_float  x_refexp;
+  t_float  x_reflog;
   t_symbol *x_set;
 } t_f2note;
 
 static t_class *f2note_class;
 
-float f2note_mtof(t_f2note *x, float midi)
+t_float f2note_mtof(t_f2note *x, t_float midi)
 {
   return(x->x_refexp * exp(0.057762265047 * midi));
 }
 
-float f2note_ftom(t_f2note *x, float freq)
+t_float f2note_ftom(t_f2note *x, t_float freq)
 {
   return (freq > 0 ? 17.31234049 * log(x->x_reflog * freq) : -1500);
 }
 
 void f2note_calc_ref(t_f2note *x)
 {
-  float ln2=log(2.0);
+  t_float ln2=log(2.0);
   
   x->x_refexp = x->x_refhz*exp(-5.75*ln2);
   x->x_reflog = 1.0/x->x_refexp;
@@ -140,16 +133,16 @@ static void f2note_bang(t_f2note *x)
   
   i = (x->x_centomidi + 50)/100;
   j = x->x_centomidi - 100*i;
-  outlet_float(x->x_outlet_cent, (float)j);
+  outlet_float(x->x_outlet_cent, (t_float)j);
   f2note_make_note(s, i);
   SETSYMBOL(&at, gensym(s));
   outlet_anything(x->x_outlet_note, x->x_set, 1, &at);
-  outlet_float(x->x_outlet_midi, 0.01*(float)(x->x_centomidi));
+  outlet_float(x->x_outlet_midi, 0.01f*(t_float)(x->x_centomidi));
 }
 
 static void f2note_float(t_f2note *x, t_floatarg freq)
 {
-  x->x_centomidi = (int)(100.0*f2note_ftom(x, freq) + 0.5);
+  x->x_centomidi = (int)(100.0f*f2note_ftom(x, freq) + 0.5f);
   f2note_bang(x);
 }
 
@@ -163,10 +156,10 @@ static void *f2note_new(t_floatarg ref)
 {
   t_f2note *x = (t_f2note *)pd_new(f2note_class);
   
-  if(ref == 0.0)
-    ref=440.0;
+  if(ref == 0.0f)
+    ref=440.0f;
   x->x_refhz = ref;
-  x->x_centomidi = (int)(100.0*ref + 0.499);
+  x->x_centomidi = (int)(100.0f*ref + 0.499f);
   f2note_calc_ref(x);
   x->x_outlet_midi = outlet_new(&x->x_obj, &s_float);
   x->x_outlet_note = outlet_new(&x->x_obj, &s_list);
diff --git a/src/iemlib1/filter~.c b/src/iemlib1/filter~.c
new file mode 100644
index 0000000..f229d65
--- /dev/null
+++ b/src/iemlib1/filter~.c
@@ -0,0 +1,813 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+
+/* ---------- filter~ - slow dynamic filter-kernel 1. and 2. order ----------- */
+
+typedef struct _filter_tilde
+{
+  t_object  x_obj;
+  t_float   wn1;
+  t_float   wn2;
+  t_float   a0;
+  t_float   a1;
+  t_float   a2;
+  t_float   b1;
+  t_float   b2;
+  t_float   sr;
+  t_float   cur_f;
+  t_float   cur_l;
+  t_float   cur_a;
+  t_float   cur_b;
+  t_float   delta_f;
+  t_float   delta_a;
+  t_float   delta_b;
+  t_float   end_f;
+  t_float   end_a;
+  t_float   end_b;
+  t_float   ticks_per_interpol_time;
+  t_float   rcp_ticks;
+  t_float   interpol_time;
+  int       ticks;
+  int       counter_f;
+  int       counter_a;
+  int       counter_b;
+  int       inv;
+  int       hp;
+  int       first_order;
+  int       event_mask;
+  void      (*calc)();
+  void      *x_debug_outlet;
+  t_atom    x_at[5];
+  t_float   x_msi;
+} t_filter_tilde;
+
+t_class *filter_tilde_class;
+
+static void filter_tilde_snafu(t_filter_tilde *x)
+{
+  
+}
+
+static void filter_tilde_lp1(t_filter_tilde *x)
+{
+  t_float al;
+  
+  al = x->cur_a * x->cur_l;
+  x->a0 = 1.0f/(1.0f + al);
+  x->a1 = x->a0;
+  x->b1 = (al - 1.0f)*x->a0;
+}
+
+static void filter_tilde_lp2(t_filter_tilde *x)
+{
+  t_float l, al, bl2, rcp;
+  
+  l = x->cur_l;
+  al = l*x->cur_a;
+  bl2 = l*l*x->cur_b + 1.0f;
+  rcp = 1.0f/(al + bl2);
+  x->a0 = rcp;
+  x->a1 = 2.0f*rcp;
+  x->a2 = x->a0;
+  x->b1 = rcp*2.0f*(bl2 - 2.0f);
+  x->b2 = rcp*(al - bl2);
+}
+
+static void filter_tilde_hp1(t_filter_tilde *x)
+{
+  t_float al, rcp;
+  
+  al = x->cur_a * x->cur_l;
+  rcp = 1.0f/(1.0f + al);
+  x->a0 = rcp*al;
+  x->a1 = -x->a0;
+  x->b1 = rcp*(al - 1.0f);
+}
+
+static void filter_tilde_hp2(t_filter_tilde *x)
+{
+  t_float l, al, bl2, rcp;
+  
+  l = x->cur_l;
+  bl2 = l*l*x->cur_b + 1.0f;
+  al = l*x->cur_a;
+  rcp = 1.0f/(al + bl2);
+  x->a0 = rcp*(bl2 - 1.0f);
+  x->a1 = -2.0f*x->a0;
+  x->a2 = x->a0;
+  x->b1 = rcp*2.0f*(bl2 - 2.0f);
+  x->b2 = rcp*(al - bl2);
+}
+
+static void filter_tilde_rp2(t_filter_tilde *x)
+{
+  t_float l, al, l2, rcp;
+  
+  l = x->cur_l;
+  l2 = l*l + 1.0f;
+  al = l*x->cur_a;
+  rcp = 1.0f/(al + l2);
+  x->a0 = rcp*l;
+  x->a2 = -x->a0;
+  x->b1 = rcp*2.0f*(l2 - 2.0f);
+  x->b2 = rcp*(al - l2);
+}
+
+static void filter_tilde_bp2(t_filter_tilde *x)
+{
+  t_float l, al, l2, rcp;
+  
+  l = x->cur_l;
+  l2 = l*l + 1.0f;
+  al = l*x->cur_a;
+  rcp = 1.0f/(al + l2);
+  x->a0 = rcp*al;
+  x->a2 = -x->a0;
+  x->b1 = rcp*2.0f*(l2 - 2.0f);
+  x->b2 = rcp*(al - l2);
+}
+
+static void filter_tilde_bs2(t_filter_tilde *x)
+{
+  t_float l, al, l2, rcp;
+  
+  l = x->cur_l;
+  l2 = l*l + 1.0f;
+  al = l*x->cur_a;
+  rcp = 1.0f/(al + l2);
+  x->a0 = rcp*l2;
+  x->a1 = rcp*2.0f*(2.0f - l2);
+  x->a2 = x->a0;
+  x->b1 = -x->a1;
+  x->b2 = rcp*(al - l2);
+}
+
+static void filter_tilde_rpw2(t_filter_tilde *x)
+{
+  t_float l, al, l2, rcp;
+  
+  l = x->cur_l;
+  l2 = l*l + 1.0f;
+  al = l*x->cur_a/x->cur_f;
+  rcp = 1.0f/(al + l2);
+  x->a0 = rcp*l;
+  x->a2 = -x->a0;
+  x->b1 = rcp*2.0f*(l2 - 2.0f);
+  x->b2 = rcp*(al - l2);
+}
+
+static void filter_tilde_bpw2(t_filter_tilde *x)
+{
+  t_float l, al, l2, rcp;
+  
+  l = x->cur_l;
+  l2 = l*l + 1.0f;
+  al = l*x->cur_a/x->cur_f;
+  rcp = 1.0f/(al + l2);
+  x->a0 = rcp*al;
+  x->a2 = -x->a0;
+  x->b1 = rcp*2.0f*(l2 - 2.0f);
+  x->b2 = rcp*(al - l2);
+}
+
+static void filter_tilde_bsw2(t_filter_tilde *x)
+{
+  t_float l, al, l2, rcp;
+  
+  l = x->cur_l;
+  l2 = l*l + 1.0f;
+  al = l*x->cur_a/x->cur_f;
+  rcp = 1.0f/(al + l2);
+  x->a0 = rcp*l2;
+  x->a1 = rcp*2.0f*(2.0f - l2);
+  x->a2 = x->a0;
+  x->b1 = -x->a1;
+  x->b2 = rcp*(al - l2);
+}
+
+static void filter_tilde_ap1(t_filter_tilde *x)
+{
+  t_float al;
+  
+  al = x->cur_a * x->cur_l;
+  x->a0 = (1.0f - al)/(1.0f + al);
+  x->b1 = -x->a0;
+}
+
+static void filter_tilde_ap2(t_filter_tilde *x)
+{
+  t_float l, al, bl2, rcp;
+  
+  l = x->cur_l;
+  bl2 = l*l*x->cur_b + 1.0f;
+  al = l*x->cur_a;
+  rcp = 1.0f/(al + bl2);
+  x->a1 = rcp*2.0f*(2.0f - bl2);
+  x->a0 = rcp*(bl2 - al);
+  x->b1 = -x->a1;
+  x->b2 = -x->a0;
+}
+
+/*static void filter_tilde_bp2(t_filter_tilde *x)
+{
+t_float l, al, l2, rcp;
+
+  l = x->cur_l;
+  l2 = l*l + 1.0;
+  al = l*x->cur_a;
+  rcp = 1.0f/(al + l2);
+  x->a0 = rcp*al;
+  x->a2 = -x->a0;
+  x->b1 = rcp*2.0f*(2.0f - l2);
+  x->b2 = rcp*(l2 - al);
+}*/
+
+static void filter_tilde_dsp_tick(t_filter_tilde *x)
+{
+  if(x->event_mask)
+  {
+    if(x->counter_f)
+    {
+      float l, si, co;
+      
+      if(x->counter_f <= 1)
+      {
+        x->cur_f = x->end_f;
+        x->counter_f = 0;
+        x->event_mask &= 6;/*set event_mask_bit 0 = 0*/
+      }
+      else
+      {
+        x->counter_f--;
+        x->cur_f *= x->delta_f;
+      }
+      l = x->cur_f * x->sr;
+      if(l < 1.0e-20f)
+        x->cur_l = 1.0e20f;
+      else if(l > 1.57079632f)
+        x->cur_l = 0.0f;
+      else
+      {
+        si = sin(l);
+        co = cos(l);
+        x->cur_l = co/si;
+      }
+    }
+    if(x->counter_a)
+    {
+      if(x->counter_a <= 1)
+      {
+        x->cur_a = x->end_a;
+        x->counter_a = 0;
+        x->event_mask &= 5;/*set event_mask_bit 1 = 0*/
+      }
+      else
+      {
+        x->counter_a--;
+        x->cur_a *= x->delta_a;
+      }
+    }
+    if(x->counter_b)
+    {
+      if(x->counter_b <= 1)
+      {
+        x->cur_b = x->end_b;
+        x->counter_b = 0;
+        x->event_mask &= 3;/*set event_mask_bit 2 = 0*/
+      }
+      else
+      {
+        x->counter_b--;
+        x->cur_b *= x->delta_b;
+      }
+    }
+    
+    (*(x->calc))(x);
+    
+    /* stability check */
+    if(x->first_order)
+    {
+      if(x->b1 <= -0.9999998f)
+        x->b1 = -0.9999998f;
+      else if(x->b1 >= 0.9999998f)
+        x->b1 = 0.9999998f;
+    }
+    else
+    {
+      float discriminant = x->b1 * x->b1 + 4.0f * x->b2;
+      
+      if(x->b1 <= -1.9999996f)
+        x->b1 = -1.9999996f;
+      else if(x->b1 >= 1.9999996f)
+        x->b1 = 1.9999996f;
+      
+      if(x->b2 <= -0.9999998f)
+        x->b2 = -0.9999998f;
+      else if(x->b2 >= 0.9999998f)
+        x->b2 = 0.9999998f;
+      
+      if(discriminant >= 0.0f)
+      {
+        if(0.9999998f - x->b1 - x->b2 < 0.0f)
+          x->b2 = 0.9999998f - x->b1;
+        if(0.9999998f + x->b1 - x->b2 < 0.0f)
+          x->b2 = 0.9999998f + x->b1;
+      }
+    }
+  }
+}
+
+static t_int *filter_tilde_perform_2o(t_int *w)
+{
+  t_float *in = (float *)(w[1]);
+  t_float *out = (float *)(w[2]);
+  t_filter_tilde *x = (t_filter_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float wn0, wn1=x->wn1, wn2=x->wn2;
+  t_float a0=x->a0, a1=x->a1, a2=x->a2;
+  t_float b1=x->b1, b2=x->b2;
+  
+  filter_tilde_dsp_tick(x);
+  for(i=0; i<n; i++)
+  {
+    wn0 = *in++ + b1*wn1 + b2*wn2;
+    *out++ = a0*wn0 + a1*wn1 + a2*wn2;
+    wn2 = wn1;
+    wn1 = wn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn2))
+    wn2 = 0.0f;
+  if(IEM_DENORMAL(wn1))
+    wn1 = 0.0f;
+  
+  x->wn1 = wn1;
+  x->wn2 = wn2;
+  return(w+5);
+}
+/*   yn0 = *out;
+xn0 = *in;
+*************
+yn0 = a0*xn0 + a1*xn1 + a2*xn2 + b1*yn1 + b2*yn2;
+yn2 = yn1;
+yn1 = yn0;
+xn2 = xn1;
+xn1 = xn0;
+*************************
+y/x = (a0 + a1*z-1 + a2*z-2)/(1 - b1*z-1 - b2*z-2);*/
+
+static t_int *filter_tilde_perf8_2o(t_int *w)
+{
+  t_float *in = (float *)(w[1]);
+  t_float *out = (float *)(w[2]);
+  t_filter_tilde *x = (t_filter_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float wn[10];
+  t_float a0=x->a0, a1=x->a1, a2=x->a2;
+  t_float b1=x->b1, b2=x->b2;
+  
+  filter_tilde_dsp_tick(x);
+  wn[0] = x->wn2;
+  wn[1] = x->wn1;
+  for(i=0; i<n; i+=8, in+=8, out+=8)
+  {
+    wn[2] = in[0] + b1*wn[1] + b2*wn[0];
+    out[0] = a0*wn[2] + a1*wn[1] + a2*wn[0];
+    wn[3] = in[1] + b1*wn[2] + b2*wn[1];
+    out[1] = a0*wn[3] + a1*wn[2] + a2*wn[1];
+    wn[4] = in[2] + b1*wn[3] + b2*wn[2];
+    out[2] = a0*wn[4] + a1*wn[3] + a2*wn[2];
+    wn[5] = in[3] + b1*wn[4] + b2*wn[3];
+    out[3] = a0*wn[5] + a1*wn[4] + a2*wn[3];
+    wn[6] = in[4] + b1*wn[5] + b2*wn[4];
+    out[4] = a0*wn[6] + a1*wn[5] + a2*wn[4];
+    wn[7] = in[5] + b1*wn[6] + b2*wn[5];
+    out[5] = a0*wn[7] + a1*wn[6] + a2*wn[5];
+    wn[8] = in[6] + b1*wn[7] + b2*wn[6];
+    out[6] = a0*wn[8] + a1*wn[7] + a2*wn[6];
+    wn[9] = in[7] + b1*wn[8] + b2*wn[7];
+    out[7] = a0*wn[9] + a1*wn[8] + a2*wn[7];
+    wn[0] = wn[8];
+    wn[1] = wn[9];
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn[0]))
+    wn[0] = 0.0f;
+  if(IEM_DENORMAL(wn[1]))
+    wn[1] = 0.0f;
+  
+  x->wn1 = wn[1];
+  x->wn2 = wn[0];
+  return(w+5);
+}
+
+static t_int *filter_tilde_perform_1o(t_int *w)
+{
+  t_float *in = (float *)(w[1]);
+  t_float *out = (float *)(w[2]);
+  t_filter_tilde *x = (t_filter_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float wn0, wn1=x->wn1;
+  t_float a0=x->a0, a1=x->a1;
+  t_float b1=x->b1;
+  
+  filter_tilde_dsp_tick(x);
+  for(i=0; i<n; i++)
+  {
+    wn0 = *in++ + b1*wn1;
+    *out++ = a0*wn0 + a1*wn1;
+    wn1 = wn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn1))
+    wn1 = 0.0f;
+  
+  x->wn1 = wn1;
+  return(w+5);
+}
+
+static t_int *filter_tilde_perf8_1o(t_int *w)
+{
+  t_float *in = (float *)(w[1]);
+  t_float *out = (float *)(w[2]);
+  t_filter_tilde *x = (t_filter_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float wn[9];
+  t_float a0=x->a0, a1=x->a1;
+  t_float b1=x->b1;
+  
+  filter_tilde_dsp_tick(x);
+  wn[0] = x->wn1;
+  for(i=0; i<n; i+=8, in+=8, out+=8)
+  {
+    wn[1] = in[0] + b1*wn[0];
+    out[0] = a0*wn[1] + a1*wn[0];
+    wn[2] = in[1] + b1*wn[1];
+    out[1] = a0*wn[2] + a1*wn[1];
+    wn[3] = in[2] + b1*wn[2];
+    out[2] = a0*wn[3] + a1*wn[2];
+    wn[4] = in[3] + b1*wn[3];
+    out[3] = a0*wn[4] + a1*wn[3];
+    wn[5] = in[4] + b1*wn[4];
+    out[4] = a0*wn[5] + a1*wn[4];
+    wn[6] = in[5] + b1*wn[5];
+    out[5] = a0*wn[6] + a1*wn[5];
+    wn[7] = in[6] + b1*wn[6];
+    out[6] = a0*wn[7] + a1*wn[6];
+    wn[8] = in[7] + b1*wn[7];
+    out[7] = a0*wn[8] + a1*wn[7];
+    wn[0] = wn[8];
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn[0]))
+    wn[0] = 0.0f;
+  
+  x->wn1 = wn[0];
+  return(w+5);
+}
+
+static void filter_tilde_ft4(t_filter_tilde *x, t_floatarg t)
+{
+  int i = (int)((x->ticks_per_interpol_time)*t+0.49999f);
+  
+  x->interpol_time = t;
+  if(i <= 0)
+  {
+    x->ticks = 1;
+    x->rcp_ticks = 1.0;
+  }
+  else
+  {
+    x->ticks = i;
+    x->rcp_ticks = 1.0 / (t_float)i;
+  }
+}
+
+static void filter_tilde_ft3(t_filter_tilde *x, t_floatarg b)
+{
+  if(b <= 0.0f)
+    b = 0.000001f;
+  if(x->hp)
+    b = 1.0 / b;
+  if(b != x->cur_b)
+  {
+    x->end_b = b;
+    x->counter_b = x->ticks;
+    x->delta_b = exp(log(b/x->cur_b)*x->rcp_ticks);
+    x->event_mask |= 4;/*set event_mask_bit 2 = 1*/
+  }
+}
+
+static void filter_tilde_ft2(t_filter_tilde *x, t_floatarg a)
+{
+  if(a <= 0.0f)
+    a = 0.000001f;
+  if(x->inv)
+    a = 1.0f / a;
+  if(x->hp)
+    a /= x->cur_b;
+  if(a != x->cur_a)
+  {
+    x->end_a = a;
+    x->counter_a = x->ticks;
+    x->delta_a = exp(log(a/x->cur_a)*x->rcp_ticks);
+    x->event_mask |= 2;/*set event_mask_bit 1 = 1*/
+  }
+}
+
+static void filter_tilde_ft1(t_filter_tilde *x, t_floatarg f)
+{
+  if(f <= 0.0f)
+    f = 0.000001f;
+  if(f != x->cur_f)
+  {
+    x->end_f = f;
+    x->counter_f = x->ticks;
+    x->delta_f = exp(log(f/x->cur_f)*x->rcp_ticks);
+    x->event_mask |= 1;/*set event_mask_bit 0 = 1*/
+  }
+}
+
+static void filter_tilde_print(t_filter_tilde *x)
+{
+  //  post("fb1 = %g, fb2 = %g, ff1 = %g, ff2 = %g, ff3 = %g", x->b1, x->b2, x->a0, x->a1, x->a2);
+  x->x_at[0].a_w.w_float = x->b1;
+  x->x_at[1].a_w.w_float = x->b2;
+  x->x_at[2].a_w.w_float = x->a0;
+  x->x_at[3].a_w.w_float = x->a1;
+  x->x_at[4].a_w.w_float = x->a2;
+  outlet_list(x->x_debug_outlet, &s_list, 5, x->x_at);
+}
+
+static void filter_tilde_dsp(t_filter_tilde *x, t_signal **sp)
+{
+  t_float si, co, f;
+  int i, n=(int)sp[0]->s_n;
+  
+  x->sr = 3.14159265358979323846f / (t_float)(sp[0]->s_sr);
+  x->ticks_per_interpol_time = 0.001f * (t_float)(sp[0]->s_sr) / (t_float)n;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time)+0.49999f);
+  if(i <= 0)
+  {
+    x->ticks = 1;
+    x->rcp_ticks = 1.0f;
+  }
+  else
+  {
+    x->ticks = i;
+    x->rcp_ticks = 1.0f / (t_float)i;
+  }
+  f = x->cur_f * x->sr;
+  if(f < 1.0e-20f)
+    x->cur_l = 1.0e20f;
+  else if(f > 1.57079632f)
+    x->cur_l = 0.0f;
+  else
+  {
+    si = sin(f);
+    co = cos(f);
+    x->cur_l = co/si;
+  }
+  if(x->first_order)
+  {
+    if(n&7)
+      dsp_add(filter_tilde_perform_1o, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+    else
+      dsp_add(filter_tilde_perf8_1o, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+  }
+  else
+  {
+    if(n&7)
+      dsp_add(filter_tilde_perform_2o, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+    else
+      dsp_add(filter_tilde_perf8_2o, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+  }
+}
+
+static void *filter_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_filter_tilde *x = (t_filter_tilde *)pd_new(filter_tilde_class);
+  int i;
+  t_float si, co, f=0.0f, a=0.0f, b=0.0f, interpol=0.0f;
+  t_symbol *filt_typ=gensym("");
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft2"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft3"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft4"));
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_debug_outlet = outlet_new(&x->x_obj, &s_list);
+  x->x_msi = 0.0f;
+  
+  x->x_at[0].a_type = A_FLOAT;
+  x->x_at[1].a_type = A_FLOAT;
+  x->x_at[2].a_type = A_FLOAT;
+  x->x_at[3].a_type = A_FLOAT;
+  x->x_at[4].a_type = A_FLOAT;
+  
+  x->event_mask = 1;
+  x->counter_f = 1;
+  x->counter_a = 0;
+  x->counter_b = 0;
+  x->delta_f = 0.0f;
+  x->delta_a = 0.0f;
+  x->delta_b = 0.0f;
+  x->interpol_time = 0.0f;
+  x->wn1 = 0.0f;
+  x->wn2 = 0.0f;
+  x->a0 = 0.0f;
+  x->a1 = 0.0f;
+  x->a2 = 0.0f;
+  x->b1 = 0.0f;
+  x->b2 = 0.0f;
+  x->sr = 3.14159265358979323846f / 44100.0f;
+  x->calc = filter_tilde_snafu;
+  x->first_order = 0;
+  if((argc == 5)&&IS_A_FLOAT(argv,4)&&IS_A_FLOAT(argv,3)&&IS_A_FLOAT(argv,2)&&IS_A_FLOAT(argv,1)&&IS_A_SYMBOL(argv,0))
+  {
+    filt_typ = atom_getsymbolarg(0, argc, argv);
+    f = (t_float)atom_getfloatarg(1, argc, argv);
+    a = (t_float)atom_getfloatarg(2, argc, argv);
+    b = (t_float)atom_getfloatarg(3, argc, argv);
+    interpol = (t_float)atom_getfloatarg(4, argc, argv);
+  }
+  x->cur_f = f;
+  f *= x->sr;
+  if(f < 1.0e-20f)
+    x->cur_l = 1.0e20f;
+  else if(f > 1.57079632f)
+    x->cur_l = 0.0f;
+  else
+  {
+    si = sin(f);
+    co = cos(f);
+    x->cur_l = co/si;
+  }
+  if(a <= 0.0f)
+    a = 0.000001f;
+  if(b <= 0.0f)
+    b = 0.000001f;
+  x->cur_b = b;
+  
+  if(interpol <= 0.0f)
+    interpol = 0.0f;
+  x->interpol_time = interpol;
+  x->ticks_per_interpol_time = 0.001f * 44100.0f / 64.0f;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time)+0.49999f);
+  if(i <= 0)
+  {
+    x->ticks = 1;
+    x->rcp_ticks = 1.0f;
+  }
+  else
+  {
+    x->ticks = i;
+    x->rcp_ticks = 1.0f / (t_float)i;
+  }
+  
+  x->calc = filter_tilde_snafu;
+  
+  x->cur_a = 1.0f/a; /*a was Q*/
+  x->inv = 1;
+  x->hp = 0;
+  
+  if(filt_typ->s_name)
+  {
+    if(filt_typ == gensym("ap1"))
+    {
+      x->calc = filter_tilde_ap1;
+      x->a1 = 1.0f;
+      x->first_order = 1;
+    }
+    else if(filt_typ == gensym("ap2"))
+    {
+      x->calc = filter_tilde_ap2;
+      x->a2 = 1.0f;
+    }
+    else if(filt_typ == gensym("ap1c"))
+    {
+      x->calc = filter_tilde_ap1;
+      x->a1 = 1.0f;
+      x->inv = 0;
+      x->cur_a = a; /*a was damping*/
+      x->first_order = 1;
+    }
+    else if(filt_typ == gensym("ap2c"))
+    {
+      x->calc = filter_tilde_ap2;
+      x->a2 = 1.0f;
+      x->inv = 0;
+      x->cur_a = a; /*a was damping*/
+    }
+    else if(filt_typ == gensym("bpq2"))
+    {
+      x->calc = filter_tilde_bp2;
+    }
+    else if(filt_typ == gensym("rbpq2"))
+    {
+      x->calc = filter_tilde_rp2;
+    }
+    else if(filt_typ == gensym("bsq2"))
+    {
+      x->calc = filter_tilde_bs2;
+    }
+    else if(filt_typ == gensym("bpw2"))
+    {
+      x->calc = filter_tilde_bpw2;
+      x->inv = 0;
+      x->cur_a = a; /*a was bw*/
+    }
+    else if(filt_typ == gensym("rbpw2"))
+    {
+      x->calc = filter_tilde_rpw2;
+      x->inv = 0;
+      x->cur_a = a; /*a was bw*/
+    }
+    else if(filt_typ == gensym("bsw2"))
+    {
+      x->calc = filter_tilde_bsw2;
+      x->inv = 0;
+      x->cur_a = a; /*a was bw*/
+    }
+    else if(filt_typ == gensym("hp1"))
+    {
+      x->calc = filter_tilde_hp1;
+      x->first_order = 1;
+    }
+    else if(filt_typ == gensym("hp2"))
+    {
+      x->calc = filter_tilde_hp2;
+    }
+    else if(filt_typ == gensym("lp1"))
+    {
+      x->calc = filter_tilde_lp1;
+      x->first_order = 1;
+    }
+    else if(filt_typ == gensym("lp2"))
+    {
+      x->calc = filter_tilde_lp2;
+    }
+    else if(filt_typ == gensym("hp1c"))
+    {
+      x->calc = filter_tilde_hp1;
+      x->cur_a = 1.0f / a;
+      x->first_order = 1;
+    }
+    else if(filt_typ == gensym("hp2c"))
+    {
+      x->calc = filter_tilde_hp2;
+      x->inv = 0;
+      x->cur_a = a / b;
+      x->cur_b = 1.0f / b;
+      x->hp = 1;
+    }
+    else if(filt_typ == gensym("lp1c"))
+    {
+      x->calc = filter_tilde_lp1;
+      x->inv = 0;
+      x->cur_a = a; /*a was damping*/
+      x->first_order = 1;
+    }
+    else if(filt_typ == gensym("lp2c"))
+    {
+      x->calc = filter_tilde_lp2;
+      x->inv = 0;
+      x->cur_a = a; /*a was damping*/
+    }
+    else
+    {
+      post("filter~-Error: 1. initial-arguments: <sym> kind: \
+lp1, lp2, hp1, hp2, \
+lp1c, lp2c, hp1c, hp2c, \
+ap1, ap2, ap1c, ap2c, \
+bpq2, rbpq2, bsq2, \
+bpw2, rbpw2, bsw2!");
+    }
+    x->end_f = x->cur_f;
+    x->end_a = x->cur_a;
+    x->end_b = x->cur_b;
+  }
+  return (x);
+}
+
+void filter_tilde_setup(void)
+{
+  filter_tilde_class = class_new(gensym("filter~"), (t_newmethod)filter_tilde_new,
+        0, sizeof(t_filter_tilde), 0, A_GIMME, 0);
+  CLASS_MAINSIGNALIN(filter_tilde_class, t_filter_tilde, x_msi);
+  class_addmethod(filter_tilde_class, (t_method)filter_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(filter_tilde_class, (t_method)filter_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+  class_addmethod(filter_tilde_class, (t_method)filter_tilde_ft2, gensym("ft2"), A_FLOAT, 0);
+  class_addmethod(filter_tilde_class, (t_method)filter_tilde_ft3, gensym("ft3"), A_FLOAT, 0);
+  class_addmethod(filter_tilde_class, (t_method)filter_tilde_ft4, gensym("ft4"), A_FLOAT, 0);
+  class_addmethod(filter_tilde_class, (t_method)filter_tilde_print, gensym("print"), 0);
+  class_sethelpsymbol(filter_tilde_class, gensym("iemhelp/help-filter~"));
+}
diff --git a/src/iemlib1/forpp.c b/src/iemlib1/forpp.c
index b1ddc9a..bbee77a 100644
--- a/src/iemlib1/forpp.c
+++ b/src/iemlib1/forpp.c
@@ -3,17 +3,9 @@
 
 iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
 
-#ifdef _MSC_VER
-#pragma warning( disable : 4244 )
-#pragma warning( disable : 4305 )
-#endif
-
 
 #include "m_pd.h"
 #include "iemlib.h"
-#include <math.h>
-#include <stdio.h>
-#include <string.h>
 
 /* ----------------------------- for++ -------------------------------- */
 /* -- an internal timed counter (start-, stop-number and metro-time) -- */
@@ -23,7 +15,7 @@ typedef struct _forpp
   t_object  x_obj;
   int       x_beg;
   int       x_end;
-  float     x_delay;
+  t_float   x_delay;
   int       x_cur;
   int       x_incr;
   void      *x_out_end;
@@ -108,7 +100,7 @@ static void forpp_stop(t_forpp *x)
   clock_unset(x->x_clock2);
 }
 
-static void forpp_float(t_forpp *x, t_float beg)
+static void forpp_float(t_forpp *x, t_floatarg beg)
 {
   x->x_beg = (int)beg;
   if(x->x_end < x->x_beg)
@@ -117,7 +109,7 @@ static void forpp_float(t_forpp *x, t_float beg)
     x->x_incr = 1;
 }
 
-static void forpp_ft1(t_forpp *x, t_float end)
+static void forpp_ft1(t_forpp *x, t_floatarg end)
 {
   x->x_end = (int)end;
   if(x->x_end < x->x_beg)
@@ -126,7 +118,7 @@ static void forpp_ft1(t_forpp *x, t_float end)
     x->x_incr = 1;
 }
 
-static void forpp_ft2(t_forpp *x, t_float delay)
+static void forpp_ft2(t_forpp *x, t_floatarg delay)
 {
   if(delay < 0.0)
     delay = 0.0;
diff --git a/src/iemlib1/gate.c b/src/iemlib1/gate.c
index f0f85be..c893e3e 100644
--- a/src/iemlib1/gate.c
+++ b/src/iemlib1/gate.c
@@ -1,19 +1,12 @@
 /* For information on usage and redistribution, and for a DISCLAIMER OF ALL
 * WARRANTIES, see the file, "LICENSE.txt," in this distribution.
 
-iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2004 */
-
-#ifdef _MSC_VER
-#pragma warning( disable : 4244 )
-#pragma warning( disable : 4305 )
-#endif
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
 
 
 #include "m_pd.h"
 #include "iemlib.h"
-#include <math.h>
-#include <stdio.h>
-#include <string.h>
+
 
 /* --------- gate ---------------------- */
 /* ----------- like spigot  ------------ */
@@ -21,7 +14,7 @@ iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2004
 typedef struct _gate
 {
   t_object  x_obj;
-  float     x_state;
+  t_float   x_state;
 } t_gate;
 
 static t_class *gate_class;
@@ -67,7 +60,7 @@ static void *gate_new(t_floatarg f)
   t_gate *x = (t_gate *)pd_new(gate_class);
   floatinlet_new(&x->x_obj, &x->x_state);
   outlet_new(&x->x_obj, 0);
-  x->x_state = (f==0.0)?0:1;
+  x->x_state = (f==0.0f)?0.0f:1.0f;
   return (x);
 }
 
diff --git a/src/iemlib1/hml_shelf~.c b/src/iemlib1/hml_shelf~.c
new file mode 100644
index 0000000..5072911
--- /dev/null
+++ b/src/iemlib1/hml_shelf~.c
@@ -0,0 +1,548 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ---------- hml_shelf~ - high-middle-low-shelving filter ----------- */
+
+typedef struct _hml_shelf_tilde
+{
+  t_object  x_obj;
+  t_float   wn1;
+  t_float   wn2;
+  t_float   a0;
+  t_float   a1;
+  t_float   a2;
+  t_float   b1;
+  t_float   b2;
+  t_float   sr;
+  t_float   cur_lf;
+  t_float   cur_hf;
+  t_float   cur_lg;
+  t_float   cur_mg;
+  t_float   cur_hg;
+  t_float   delta_lf;
+  t_float   delta_hf;
+  t_float   delta_lg;
+  t_float   delta_mg;
+  t_float   delta_hg;
+  t_float   end_lf;
+  t_float   end_hf;
+  t_float   end_lg;
+  t_float   end_mg;
+  t_float   end_hg;
+  t_float   ticks_per_interpol_time;
+  t_float   rcp_ticks;
+  t_float   interpol_time;
+  int       ticks;
+  int       counter_lf;
+  int       counter_hf;
+  int       counter_lg;
+  int       counter_mg;
+  int       counter_hg;
+  int       event_mask;
+  void      *x_debug_outlet;
+  t_atom    x_at[5];
+  t_float   x_msi;
+} t_hml_shelf_tilde;
+
+t_class *hml_shelf_tilde_class;
+
+static void hml_shelf_tilde_calc(t_hml_shelf_tilde *x)
+{
+  t_float rf = x->cur_hf/x->cur_lf;
+  t_float mf = x->cur_hf*x->cur_lf;
+  t_float lg = x->cur_lg;
+  t_float rcplg = 1.0f/lg;
+  t_float mg = x->cur_mg;
+  t_float rcpmg = 1.0f/mg;
+  t_float hg = x->cur_hg;
+  t_float rcphg = 1.0f/hg;
+  t_float f = mf*x->sr;
+  t_float l = cos(f)/sin(f);
+  t_float k1 = rf*l;
+  t_float k2 = l/rf;
+  t_float k3 = l*l;
+  t_float k4 = k3*hg;
+  t_float k5 = k3*rcphg;
+  t_float k6 = rcplg + k5;
+  t_float k7 = rcpmg*k1 + k2*rcplg*rcphg*mg;
+  t_float k8 = lg + k4;
+  t_float k9 = mg*k1 + k2*lg*hg*rcpmg;
+  t_float k10 = 1.0f/(k6 + k7);
+  
+  x->b2 = k10*(k7 - k6);
+  x->b1 = k10*2.0f*(k5 - rcplg);
+  x->a2 = k10*(k8 - k9);
+  x->a1 = k10*2.0f*(lg - k4);
+  x->a0 = k10*(k8 + k9);
+}
+
+/*
+high- & low- shelving-filter:
+L....sqrt(lowlevel);
+rL...rsqrt(lowlevel);
+M....sqrt(mediumlevel);
+rM...rsqrt(mediumlevel);
+H....sqrt(highlevel);
+rH...rsqrt(highlevel);
+V....sqrt(highfrequency/lowfrequency);
+P....j*2*pi*f/(2*pi*V*lowfrequency);
+
+Y/X = [M/(1/M)] * [(L/M + PV)/(M/L + PV)] * [(1 + HP/(VM))/(1 + MP/(VH))];
+Y/X = (L + P*(M*V + L*H/(V*M)) + P*P*H) / (rL + P*(rM*V + rL*rH/(V*rM)) + P*P*rH);
+  
+hlshlv: lowlevel: ll; mediumlevel: lm; highlevel: hl; lowfrequency: fl; highfrequency: fh; samplerate: sr;
+    
+V = sqrt(fh/fl);
+f = fl*V;
+L = sqrt(ll);
+rL = 1.0/L;
+M = sqrt(lm);
+rM = 1.0/M;
+H = sqrt(lh);
+rH = 1.0/H;
+   
+l = cot(f*3.14159265358979323846/sr);
+k1 = V*l;
+k2 = l/V;
+l2 = l*l;
+l3 = l2*H;
+l4 = l2*rH;
+m1 = k2*L*H*rM;
+m2 = k2*rL*rH*M;
+n1 = rL + l4;
+n2 = rM*k1 + m2;
+p1 = L + l3;
+p2 = M*k1 + m1;
+a012 = 1.0/(n1 + n2);
+    
+b2 = a012*(n2 - n1);
+b1 = a012*2.0*(l4 - rL);
+a2 = a012*(p1 - p2);
+a1 = a012*2.0*(L - l3);
+a0 = a012*(p1 + p2);
+
+rf = sqrt(fh/fl);
+mf = fl*rf;
+L = sqrt(ll);
+rL = 1.0/L;
+M = sqrt(lm);
+rM = 1.0/M;
+H = sqrt(lh);
+rH = 1.0/H;
+                    
+l = cot(fm*3.14159265358979323846/sr);
+k1 = V*l;
+k2 = l/V;
+k3 = l*l;
+k4 = k3*H;
+k5 = k3*rH;
+k6 = rL + k5;
+k7 = rM*k1 + k2*rL*rH*M;
+k8 = L + k4;
+k9 = M*k1 + k2*L*H*rM;
+k10 = 1.0/(k6 + k7);
+                     
+b2 = k10*(k7 - k6);
+b1 = k10*2.0*(k5 - rL);
+a2 = k10*(k8 - k9);
+a1 = k10*2.0*(L - k4);
+a0 = k10*(k8 + k9);
+*/
+                        
+
+static void hml_shelf_tilde_dsp_tick(t_hml_shelf_tilde *x)
+{
+  if(x->event_mask)
+  {
+    t_float discriminant;
+    
+    if(x->counter_lg)
+    {
+      if(x->counter_lg <= 1)
+      {
+        x->cur_lg = x->end_lg;
+        x->counter_lg = 0;
+        x->event_mask &= 30;/*set event_mask_bit 0 = 0*/
+      }
+      else
+      {
+        x->counter_lg--;
+        x->cur_lg *= x->delta_lg;
+      }
+    }
+    if(x->counter_lf)
+    {
+      if(x->counter_lf <= 1)
+      {
+        x->cur_lf = x->end_lf;
+        x->counter_lf = 0;
+        x->event_mask &= 29;/*set event_mask_bit 1 = 0*/
+      }
+      else
+      {
+        x->counter_lf--;
+        x->cur_lf *= x->delta_lf;
+      }
+    }
+    if(x->counter_mg)
+    {
+      if(x->counter_mg <= 1)
+      {
+        x->cur_mg = x->end_mg;
+        x->counter_mg = 0;
+        x->event_mask &= 27;/*set event_mask_bit 2 = 0*/
+      }
+      else
+      {
+        x->counter_mg--;
+        x->cur_mg *= x->delta_mg;
+      }
+    }
+    if(x->counter_hf)
+    {
+      if(x->counter_hf <= 1)
+      {
+        x->cur_hf = x->end_hf;
+        x->counter_hf = 0;
+        x->event_mask &= 23;/*set event_mask_bit 3 = 0*/
+      }
+      else
+      {
+        x->counter_hf--;
+        x->cur_hf *= x->delta_hf;
+      }
+    }
+    if(x->counter_hg)
+    {
+      if(x->counter_hg <= 1)
+      {
+        x->cur_hg = x->end_hg;
+        x->counter_hg = 0;
+        x->event_mask &= 15;/*set event_mask_bit 4 = 0*/
+      }
+      else
+      {
+        x->counter_hg--;
+        x->cur_hg *= x->delta_hg;
+      }
+    }
+    hml_shelf_tilde_calc(x);
+    
+    /* stability check */
+    
+    discriminant = x->b1 * x->b1 + 4.0f * x->b2;
+    if(x->b1 <= -1.9999996f)
+      x->b1 = -1.9999996f;
+    else if(x->b1 >= 1.9999996f)
+      x->b1 = 1.9999996f;
+    
+    if(x->b2 <= -0.9999998f)
+      x->b2 = -0.9999998f;
+    else if(x->b2 >= 0.9999998f)
+      x->b2 = 0.9999998f;
+    
+    if(discriminant >= 0.0f)
+    {
+      if(0.9999998f - x->b1 - x->b2 < 0.0f)
+        x->b2 = 0.9999998f - x->b1;
+      if(0.9999998f + x->b1 - x->b2 < 0.0f)
+        x->b2 = 0.9999998f + x->b1;
+    }
+  }
+}
+
+static t_int *hml_shelf_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_hml_shelf_tilde *x = (t_hml_shelf_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float wn0, wn1=x->wn1, wn2=x->wn2;
+  t_float a0=x->a0, a1=x->a1, a2=x->a2;
+  t_float b1=x->b1, b2=x->b2;
+  
+  hml_shelf_tilde_dsp_tick(x);
+  for(i=0; i<n; i++)
+  {
+    wn0 = *in++ + b1*wn1 + b2*wn2;
+    *out++ = a0*wn0 + a1*wn1 + a2*wn2;
+    wn2 = wn1;
+    wn1 = wn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn2))
+    wn2 = 0.0f;
+  if(IEM_DENORMAL(wn1))
+    wn1 = 0.0f;
+  
+  x->wn1 = wn1;
+  x->wn2 = wn2;
+  return(w+5);
+}
+
+/*   yn0 = *out;
+xn0 = *in;
+*************
+yn0 = a0*xn0 + a1*xn1 + a2*xn2 + b1*yn1 + b2*yn2;
+yn2 = yn1;
+yn1 = yn0;
+xn2 = xn1;
+xn1 = xn0;
+*************************
+y/x = (a0 + a1*z-1 + a2*z-2)/(1 - b1*z-1 - b2*z-2);
+*/
+
+static t_int *hml_shelf_tilde_perf8(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_hml_shelf_tilde *x = (t_hml_shelf_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float wn[10];
+  t_float a0=x->a0, a1=x->a1, a2=x->a2;
+  t_float b1=x->b1, b2=x->b2;
+  
+  hml_shelf_tilde_dsp_tick(x);
+  wn[0] = x->wn2;
+  wn[1] = x->wn1;
+  for(i=0; i<n; i+=8, in+=8, out+=8)
+  {
+    wn[2] = in[0] + b1*wn[1] + b2*wn[0];
+    out[0] = a0*wn[2] + a1*wn[1] + a2*wn[0];
+    wn[3] = in[1] + b1*wn[2] + b2*wn[1];
+    out[1] = a0*wn[3] + a1*wn[2] + a2*wn[1];
+    wn[4] = in[2] + b1*wn[3] + b2*wn[2];
+    out[2] = a0*wn[4] + a1*wn[3] + a2*wn[2];
+    wn[5] = in[3] + b1*wn[4] + b2*wn[3];
+    out[3] = a0*wn[5] + a1*wn[4] + a2*wn[3];
+    wn[6] = in[4] + b1*wn[5] + b2*wn[4];
+    out[4] = a0*wn[6] + a1*wn[5] + a2*wn[4];
+    wn[7] = in[5] + b1*wn[6] + b2*wn[5];
+    out[5] = a0*wn[7] + a1*wn[6] + a2*wn[5];
+    wn[8] = in[6] + b1*wn[7] + b2*wn[6];
+    out[6] = a0*wn[8] + a1*wn[7] + a2*wn[6];
+    wn[9] = in[7] + b1*wn[8] + b2*wn[7];
+    out[7] = a0*wn[9] + a1*wn[8] + a2*wn[7];
+    wn[0] = wn[8];
+    wn[1] = wn[9];
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn[0]))
+    wn[0] = 0.0f;
+  if(IEM_DENORMAL(wn[1]))
+    wn[1] = 0.0f;
+  
+  x->wn1 = wn[1];
+  x->wn2 = wn[0];
+  return(w+5);
+}
+
+static void hml_shelf_tilde_ft6(t_hml_shelf_tilde *x, t_floatarg t)
+{
+  int i = (int)((x->ticks_per_interpol_time)*t);
+  
+  x->interpol_time = t;
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+}
+
+static void hml_shelf_tilde_ft5(t_hml_shelf_tilde *x, t_floatarg hl)
+{
+  t_float hg = exp(0.057564627325 * hl);
+  
+  if(hg != x->cur_hg)
+  {
+    x->end_hg = hg;
+    x->counter_hg = x->ticks;
+    x->delta_hg = exp(log(hg/x->cur_hg)*x->rcp_ticks);
+    x->event_mask |= 16;/*set event_mask_bit 4 = 1*/
+  }
+}
+
+static void hml_shelf_tilde_ft4(t_hml_shelf_tilde *x, t_floatarg hf)
+{
+  t_float sqhf;
+  
+  if(hf <= 0.0f)
+    hf = 0.000001f;
+  sqhf = sqrt(hf);
+  if(sqhf != x->cur_hf)
+  {
+    x->end_hf = sqhf;
+    x->counter_hf = x->ticks;
+    x->delta_hf = exp(log(sqhf/x->cur_hf)*x->rcp_ticks);
+    x->event_mask |= 8;/*set event_mask_bit 3 = 1*/
+  }
+}
+
+static void hml_shelf_tilde_ft3(t_hml_shelf_tilde *x, t_floatarg ml)
+{
+  t_float mg = exp(0.057564627325 * ml);
+  
+  if(mg != x->cur_mg)
+  {
+    x->end_mg = mg;
+    x->counter_mg = x->ticks;
+    x->delta_mg = exp(log(mg/x->cur_mg)*x->rcp_ticks);
+    x->event_mask |= 4;/*set event_mask_bit 2 = 1*/
+  }
+}
+
+static void hml_shelf_tilde_ft2(t_hml_shelf_tilde *x, t_floatarg lf)
+{
+  t_float sqlf;
+  
+  if(lf <= 0.0f)
+    lf = 0.000001f;
+  sqlf = sqrt(lf);
+  if(sqlf != x->cur_lf)
+  {
+    x->end_lf = sqlf;
+    x->counter_lf = x->ticks;
+    x->delta_lf = exp(log(sqlf/x->cur_lf)*x->rcp_ticks);
+    x->event_mask |= 2;/*set event_mask_bit 1 = 1*/
+  }
+}
+
+static void hml_shelf_tilde_ft1(t_hml_shelf_tilde *x, t_floatarg ll)
+{
+  t_float lg = exp(0.057564627325 * ll);
+  
+  if(lg != x->cur_lg)
+  {
+    x->end_lg = lg;
+    x->counter_lg = x->ticks;
+    x->delta_lg = exp(log(lg/x->cur_lg)*x->rcp_ticks);
+    x->event_mask |= 1;/*set event_mask_bit 0 = 1*/
+  }
+}
+
+static void hml_shelf_tilde_print(t_hml_shelf_tilde *x)
+{
+  //  post("fb1 = %g, fb2 = %g, ff1 = %g, ff2 = %g, ff3 = %g", x->b1, x->b2, x->a0, x->a1, x->a2);
+  x->x_at[0].a_w.w_float = x->b1;
+  x->x_at[1].a_w.w_float = x->b2;
+  x->x_at[2].a_w.w_float = x->a0;
+  x->x_at[3].a_w.w_float = x->a1;
+  x->x_at[4].a_w.w_float = x->a2;
+  outlet_list(x->x_debug_outlet, &s_list, 5, x->x_at);
+}
+
+static void hml_shelf_tilde_dsp(t_hml_shelf_tilde *x, t_signal **sp)
+{
+  int i, n=(int)sp[0]->s_n;
+  
+  x->sr = 3.14159265358979323846f / (t_float)(sp[0]->s_sr);
+  x->ticks_per_interpol_time = 0.001f * (t_float)(sp[0]->s_sr) / (t_float)n;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+  if(n&7)
+    dsp_add(hml_shelf_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+  else
+    dsp_add(hml_shelf_tilde_perf8, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+}
+
+static void *hml_shelf_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_hml_shelf_tilde *x = (t_hml_shelf_tilde *)pd_new(hml_shelf_tilde_class);
+  int i;
+  t_float lf=200.0f, hf=2000.0f, ll=0.0f, ml=0.0f, hl=0.0f, interpol=0.0f;
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft2"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft3"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft4"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft5"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft6"));
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_debug_outlet = outlet_new(&x->x_obj, &s_list);
+  x->x_msi = 0;
+  
+  x->x_at[0].a_type = A_FLOAT;
+  x->x_at[1].a_type = A_FLOAT;
+  x->x_at[2].a_type = A_FLOAT;
+  x->x_at[3].a_type = A_FLOAT;
+  x->x_at[4].a_type = A_FLOAT;
+  
+  x->event_mask = 2;
+  x->counter_lg = 0;
+  x->counter_lf = 1;
+  x->counter_mg = 0;
+  x->counter_hf = 0;
+  x->counter_hg = 0;
+  x->delta_lg = 0.0f;
+  x->delta_lf = 0.0f;
+  x->delta_mg = 0.0f;
+  x->delta_hf = 0.0f;
+  x->delta_hg = 0.0f;
+  x->interpol_time = 0.0f;
+  x->wn1 = 0.0f;
+  x->wn2 = 0.0f;
+  x->a0 = 0.0f;
+  x->a1 = 0.0f;
+  x->a2 = 0.0f;
+  x->b1 = 0.0f;
+  x->b2 = 0.0f;
+  x->sr = 3.14159265358979323846f / 44100.0f;
+  if((argc == 6)&&IS_A_FLOAT(argv,5)&&IS_A_FLOAT(argv,4)&&IS_A_FLOAT(argv,3)
+    &&IS_A_FLOAT(argv,2)&&IS_A_FLOAT(argv,1)&&IS_A_FLOAT(argv,0))
+  {
+    ll = (t_float)atom_getfloatarg(0, argc, argv);
+    lf = (t_float)atom_getfloatarg(1, argc, argv);
+    ml = (t_float)atom_getfloatarg(2, argc, argv);
+    hf = (t_float)atom_getfloatarg(3, argc, argv);
+    hl = (t_float)atom_getfloatarg(4, argc, argv);
+    interpol = (t_float)atom_getfloatarg(5, argc, argv);
+  }
+  x->cur_lg = exp(0.057564627325 * ll);
+  x->cur_mg = exp(0.057564627325 * ml);
+  x->cur_hg = exp(0.057564627325 * hl);
+  if(lf <= 0.0f)
+    lf = 0.000001f;
+  if(hf <= 0.0f)
+    hf = 0.000001f;
+  x->cur_lf = sqrt(lf);
+  x->cur_hf = sqrt(hf);
+  if(interpol < 0.0f)
+    interpol = 0.0f;
+  x->interpol_time = interpol;
+  x->ticks_per_interpol_time = 0.5f;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+  x->end_lf = x->cur_lf;
+  x->end_hf = x->cur_hf;
+  x->end_lg = x->cur_lg;
+  x->end_mg = x->cur_mg;
+  x->end_hg = x->cur_hg;
+  return(x);
+}
+
+void hml_shelf_tilde_setup(void)
+{
+  hml_shelf_tilde_class = class_new(gensym("hml_shelf~"), (t_newmethod)hml_shelf_tilde_new,
+    0, sizeof(t_hml_shelf_tilde), 0, A_GIMME, 0);
+  CLASS_MAINSIGNALIN(hml_shelf_tilde_class, t_hml_shelf_tilde, x_msi);
+  class_addmethod(hml_shelf_tilde_class, (t_method)hml_shelf_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(hml_shelf_tilde_class, (t_method)hml_shelf_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+  class_addmethod(hml_shelf_tilde_class, (t_method)hml_shelf_tilde_ft2, gensym("ft2"), A_FLOAT, 0);
+  class_addmethod(hml_shelf_tilde_class, (t_method)hml_shelf_tilde_ft3, gensym("ft3"), A_FLOAT, 0);
+  class_addmethod(hml_shelf_tilde_class, (t_method)hml_shelf_tilde_ft4, gensym("ft4"), A_FLOAT, 0);
+  class_addmethod(hml_shelf_tilde_class, (t_method)hml_shelf_tilde_ft5, gensym("ft5"), A_FLOAT, 0);
+  class_addmethod(hml_shelf_tilde_class, (t_method)hml_shelf_tilde_ft6, gensym("ft6"), A_FLOAT, 0);
+  class_addmethod(hml_shelf_tilde_class, (t_method)hml_shelf_tilde_print, gensym("print"), 0);
+  class_sethelpsymbol(hml_shelf_tilde_class, gensym("iemhelp/help-hml_shelf~"));
+}
diff --git a/src/iemlib1/iem_cot4~.c b/src/iemlib1/iem_cot4~.c
new file mode 100644
index 0000000..52b48f7
--- /dev/null
+++ b/src/iemlib1/iem_cot4~.c
@@ -0,0 +1,168 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ------------------------ iem_cot4~ ----------------------------- */
+
+t_float *iem_cot4_tilde_table_cos=(t_float *)0L;
+t_float *iem_cot4_tilde_table_sin=(t_float *)0L;
+
+static t_class *iem_cot4_tilde_class;
+
+typedef struct _iem_cot4_tilde
+{
+  t_object  x_obj;
+  t_float   x_sr;
+  t_float   x_msi;
+} t_iem_cot4_tilde;
+
+static t_int *iem_cot4_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_float norm_freq;
+  t_float hout;
+  t_iem_cot4_tilde *x = (t_iem_cot4_tilde *)(w[3]);
+  t_float sr=x->x_sr;
+  int n = (int)(w[4]);
+  t_float *ctab = iem_cot4_tilde_table_cos, *stab = iem_cot4_tilde_table_sin;
+  t_float *caddr, *saddr, cf1, cf2, sf1, sf2, frac;
+  double dphase;
+  int normhipart;
+  int32 mytfi;
+  union tabfudge tf;
+  
+  tf.tf_d = UNITBIT32;
+  normhipart = tf.tf_i[HIOFFSET];
+  
+#if 0     /* this is the readable version of the code. */
+  while (n--)
+  {
+    norm_freq = *in * sr;
+    if(norm_freq < 0.0001f)
+      norm_freq = 0.0001f;
+    else if(norm_freq > 0.9f)
+      norm_freq = 0.9f;
+    dphase = (double)(norm_freq * (t_float)(COSTABSIZE)) + UNITBIT32;
+    tf.tf_d = dphase;
+    mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
+    saddr = stab + (mytfi);
+    caddr = ctab + (mytfi);
+    tf.tf_i[HIOFFSET] = normhipart;
+    frac = tf.tf_d - UNITBIT32;
+    sf1 = saddr[0];
+    sf2 = saddr[1];
+    cf1 = caddr[0];
+    cf2 = caddr[1];
+    in++;
+    *out++ = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
+  }
+#endif
+#if 1     /* this is the same, unwrapped by hand. prolog beg*/
+  n /= 4;
+  norm_freq = *in * sr;
+  if(norm_freq < 0.0001f)
+    norm_freq = 0.0001f;
+  else if(norm_freq > 0.9f)
+    norm_freq = 0.9f;
+  dphase = (double)(norm_freq * (t_float)(COSTABSIZE)) + UNITBIT32;
+  tf.tf_d = dphase;
+  mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
+  saddr = stab + (mytfi);
+  caddr = ctab + (mytfi);
+  tf.tf_i[HIOFFSET] = normhipart;   
+  in += 4;                 /*prolog end*/
+  while (--n)
+  {
+    norm_freq = *in * sr;
+    if(norm_freq < 0.0001f)
+      norm_freq = 0.0001f;
+    else if(norm_freq > 0.9f)
+      norm_freq = 0.9f;
+    dphase = (double)(norm_freq * (t_float)(COSTABSIZE)) + UNITBIT32;
+    frac = tf.tf_d - UNITBIT32;
+    tf.tf_d = dphase;
+    sf1 = saddr[0];
+    sf2 = saddr[1];
+    cf1 = caddr[0];
+    cf2 = caddr[1];
+    mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
+    saddr = stab + (mytfi);
+    caddr = ctab + (mytfi);
+    hout = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
+    *out++ = hout;
+    *out++ = hout;
+    *out++ = hout;
+    *out++ = hout;
+    in += 4;
+    tf.tf_i[HIOFFSET] = normhipart;
+  }/*epilog beg*/
+  frac = tf.tf_d - UNITBIT32;
+  sf1 = saddr[0];
+  sf2 = saddr[1];
+  cf1 = caddr[0];
+  cf2 = caddr[1];
+  hout = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
+  *out++ = hout;
+  *out++ = hout;
+  *out++ = hout;
+  *out++ = hout;
+  /*epilog end*/
+#endif
+  return (w+5);
+}
+
+static void iem_cot4_tilde_dsp(t_iem_cot4_tilde *x, t_signal **sp)
+{
+  x->x_sr = 2.0f / (t_float)sp[0]->s_sr;
+  dsp_add(iem_cot4_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void iem_cot4_tilde_maketable(void)
+{
+  int i;
+  t_float *fp, phase, fff, phsinc = 0.5*3.141592653 / ((t_float)COSTABSIZE);
+  union tabfudge tf;
+  
+  if(!iem_cot4_tilde_table_sin)
+  {
+    iem_cot4_tilde_table_sin = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
+    for(i=COSTABSIZE+1, fp=iem_cot4_tilde_table_sin, phase=0; i--; fp++, phase+=phsinc)
+      *fp = sin(phase);
+  }
+  if(!iem_cot4_tilde_table_cos)
+  {
+    iem_cot4_tilde_table_cos = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
+    for(i=COSTABSIZE+1, fp=iem_cot4_tilde_table_cos, phase=0; i--; fp++, phase+=phsinc)
+      *fp = cos(phase);
+  }
+  tf.tf_d = UNITBIT32 + 0.5;
+  if((unsigned)tf.tf_i[LOWOFFSET] != 0x80000000)
+    bug("iem_cot4~: unexpected machine alignment");
+}
+
+static void *iem_cot4_tilde_new(void)
+{
+  t_iem_cot4_tilde *x = (t_iem_cot4_tilde *)pd_new(iem_cot4_tilde_class);
+  
+  outlet_new(&x->x_obj, gensym("signal"));
+  x->x_msi = 0;
+  return (x);
+}
+
+void iem_cot4_tilde_setup(void)
+{
+  iem_cot4_tilde_class = class_new(gensym("iem_cot4~"), (t_newmethod)iem_cot4_tilde_new, 0,
+    sizeof(t_iem_cot4_tilde), 0, 0);
+  class_addcreator((t_newmethod)iem_cot4_tilde_new, gensym("iem_cot~"), 0);
+  CLASS_MAINSIGNALIN(iem_cot4_tilde_class, t_iem_cot4_tilde, x_msi);
+  class_addmethod(iem_cot4_tilde_class, (t_method)iem_cot4_tilde_dsp, gensym("dsp"), 0);
+  iem_cot4_tilde_maketable();
+  class_sethelpsymbol(iem_cot4_tilde_class, gensym("iemhelp/help-iem_cot4~"));
+}
diff --git a/src/iemlib1/iem_delay~.c b/src/iemlib1/iem_delay~.c
new file mode 100644
index 0000000..2a2e49d
--- /dev/null
+++ b/src/iemlib1/iem_delay~.c
@@ -0,0 +1,201 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+
+
+/* -------------------------- iem_delay~ ------------------------------ */
+
+static t_class *iem_delay_tilde_class;
+
+#define IEMDELAY_DEF_VEC_SIZE 64
+
+typedef struct _iem_delay_tilde
+{
+  t_object  x_obj;
+  int       x_mallocsize;
+  t_float   x_max_delay_ms;
+  t_float   x_current_delay_ms;
+  t_float   *x_begmem1;
+  t_float   *x_begmem2;
+  int       x_writeindex;
+  int       x_blocksize;
+  int       x_delay_samples;
+  t_float   x_sr;
+  t_float   x_msi;
+} t_iem_delay_tilde;
+
+static void iem_delay_tilde_cur_del(t_iem_delay_tilde *x, t_floatarg f)
+{
+  if(f < 0.0f)
+    f = 0.0f;
+  else if(f > x->x_max_delay_ms)
+    f = x->x_max_delay_ms;
+  x->x_current_delay_ms = f;
+  x->x_delay_samples = (int)(0.001f*x->x_sr * f + 0.5f);
+}
+
+static t_int *iem_delay_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_iem_delay_tilde *x = (t_iem_delay_tilde *)(w[3]);
+  int n=(int)(w[4]);
+  int writeindex = x->x_writeindex;
+  t_float *vec1, *vec2, *vec3;
+  
+  vec1 = x->x_begmem1 + writeindex;
+  vec2 = x->x_begmem2 + writeindex;
+  vec3 = x->x_begmem2 + writeindex - x->x_delay_samples;
+  writeindex += n;
+  while(n--)
+  {
+    *vec1++ = *vec2++ = *in++;
+    *out++ = *vec3++;
+  }
+  if(writeindex >= x->x_mallocsize)
+  {
+    writeindex -= x->x_mallocsize;
+  }
+  x->x_writeindex = writeindex;
+  return(w+5);
+}
+
+static t_int *iem_delay_tilde_perf8(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_iem_delay_tilde *x = (t_iem_delay_tilde *)(w[3]);
+  int i, n=(int)(w[4]);
+  int writeindex = x->x_writeindex;
+  t_float *vec1, *vec2;
+  
+  vec1 = x->x_begmem1 + writeindex;
+  vec2 = x->x_begmem2 + writeindex;
+  for(i=0; i<n; i+=8)
+  {
+    *vec1++ = *vec2++ = *in++;
+    *vec1++ = *vec2++ = *in++;
+    *vec1++ = *vec2++ = *in++;
+    *vec1++ = *vec2++ = *in++;
+    *vec1++ = *vec2++ = *in++;
+    *vec1++ = *vec2++ = *in++;
+    *vec1++ = *vec2++ = *in++;
+    *vec1++ = *vec2++ = *in++;
+  }
+  
+  vec2 = x->x_begmem2 + writeindex - x->x_delay_samples;
+  for(i=0; i<n; i+=8)
+  {
+    *out++ = *vec2++;
+    *out++ = *vec2++;
+    *out++ = *vec2++;
+    *out++ = *vec2++;
+    *out++ = *vec2++;
+    *out++ = *vec2++;
+    *out++ = *vec2++;
+    *out++ = *vec2++;
+  }
+  
+  writeindex += n;
+  if(writeindex >= x->x_mallocsize)
+  {
+    writeindex -= x->x_mallocsize;
+  }
+  x->x_writeindex = writeindex;
+  return(w+5);
+}
+
+static void iem_delay_tilde_dsp(t_iem_delay_tilde *x, t_signal **sp)
+{
+  int blocksize = sp[0]->s_n, i;
+  
+  if(!x->x_blocksize)/*first time*/
+  {
+    int nsamps = x->x_max_delay_ms * (t_float)sp[0]->s_sr * 0.001f;
+    
+    if(nsamps < 1)
+      nsamps = 1;
+    nsamps += ((- nsamps) & (blocksize - 1));
+    nsamps += blocksize;
+    x->x_mallocsize = nsamps;
+    x->x_begmem1 = (t_float *)getbytes(2 * x->x_mallocsize * sizeof(t_float));
+    x->x_begmem2 = x->x_begmem1 + x->x_mallocsize;
+    post("beginn = %x", (unsigned long)x->x_begmem1);
+    x->x_writeindex = blocksize;
+    x->x_sr = (t_float)sp[0]->s_sr;
+    x->x_blocksize = blocksize;
+    x->x_delay_samples = (int)(0.001f*x->x_sr * x->x_current_delay_ms + 0.5f);
+  }
+  else if((x->x_blocksize != blocksize) || ((t_float)sp[0]->s_sr != x->x_sr))
+  {
+    int nsamps = x->x_max_delay_ms * (t_float)sp[0]->s_sr * 0.001f;
+    
+    if(nsamps < 1)
+      nsamps = 1;
+    nsamps += ((- nsamps) & (blocksize - 1));
+    nsamps += blocksize;
+    
+    x->x_begmem1 = (t_float *)resizebytes(x->x_begmem1, 2*x->x_mallocsize*sizeof(t_float), 2*nsamps*sizeof(t_float));
+    x->x_mallocsize = nsamps;
+    x->x_begmem2 = x->x_begmem1 + x->x_mallocsize;
+    post("beginn = %x", (unsigned long)x->x_begmem1);
+    if(x->x_writeindex >= nsamps)
+      x->x_writeindex -= nsamps;
+    x->x_sr = (t_float)sp[0]->s_sr;
+    x->x_blocksize = blocksize;
+    x->x_delay_samples = (int)(0.001f*x->x_sr * x->x_current_delay_ms + 0.5f);
+  }
+  
+  if(blocksize&7)
+    dsp_add(iem_delay_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, blocksize);
+  else
+    dsp_add(iem_delay_tilde_perf8, 4, sp[0]->s_vec, sp[1]->s_vec, x, blocksize);
+}
+
+static void *iem_delay_tilde_new(t_floatarg max_delay_ms, t_floatarg current_delay_ms)
+{
+  t_iem_delay_tilde *x = (t_iem_delay_tilde *)pd_new(iem_delay_tilde_class);
+  int nsamps;
+  
+  if(max_delay_ms < 2.0f)
+    max_delay_ms = 2.0f;
+  x->x_max_delay_ms = max_delay_ms;
+  if(current_delay_ms < 0.0f)
+    current_delay_ms = 0.0f;
+  else if(current_delay_ms > max_delay_ms)
+    current_delay_ms = max_delay_ms;
+  x->x_current_delay_ms = current_delay_ms;
+  nsamps = max_delay_ms * sys_getsr() * 0.001f;
+  if(nsamps < 1)
+    nsamps = 1;
+  nsamps += ((- nsamps) & (IEMDELAY_DEF_VEC_SIZE - 1));
+  nsamps += IEMDELAY_DEF_VEC_SIZE;
+  x->x_mallocsize = nsamps;
+  x->x_begmem1 = (t_float *)getbytes(2 * x->x_mallocsize * sizeof(t_float));
+  x->x_begmem2 = x->x_begmem1 + x->x_mallocsize;
+  x->x_writeindex = IEMDELAY_DEF_VEC_SIZE;
+  x->x_blocksize = 0;
+  x->x_sr = 0.0f;
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_msi = 0.0f;
+  return (x);
+}
+
+static void iem_delay_tilde_free(t_iem_delay_tilde *x)
+{
+  freebytes(x->x_begmem1, 2 * x->x_mallocsize * sizeof(t_float));
+}
+
+void iem_delay_tilde_setup(void)
+{
+  iem_delay_tilde_class = class_new(gensym("iem_delay~"), (t_newmethod)iem_delay_tilde_new, (t_method)iem_delay_tilde_free,
+    sizeof(t_iem_delay_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(iem_delay_tilde_class, t_iem_delay_tilde, x_msi);
+  class_addmethod(iem_delay_tilde_class, (t_method)iem_delay_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(iem_delay_tilde_class, (t_method)iem_delay_tilde_cur_del, gensym("ft1"), A_FLOAT, 0);
+}
diff --git a/src/iemlib1/iem_pow4~.c b/src/iemlib1/iem_pow4~.c
new file mode 100644
index 0000000..50bc7c2
--- /dev/null
+++ b/src/iemlib1/iem_pow4~.c
@@ -0,0 +1,78 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ------------------------ iem_pow4~ ----------------------------- */
+
+static t_class *iem_pow4_tilde_class;
+
+typedef struct _iem_pow4_tilde
+{
+  t_object  x_obj;
+  t_float   x_exp;
+  t_float   x_msi;
+} t_iem_pow4_tilde;
+
+static void iem_pow4_tilde_ft1(t_iem_pow4_tilde *x, t_floatarg f)
+{
+  x->x_exp = f;
+}
+
+static t_int *iem_pow4_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_iem_pow4_tilde *x = (t_iem_pow4_tilde *)(w[3]);
+  t_float y=x->x_exp;
+  t_float f, g;
+  int n = (int)(w[4])/4;
+  
+  while (n--)
+  {
+    f = *in;
+    if(f < 0.01f)
+      f = 0.01f;
+    else if(f > 1000.0f)
+      f = 1000.0f;
+    g = log(f);
+    f = exp(g*y);
+    *out++ = f;
+    *out++ = f;
+    *out++ = f;
+    *out++ = f;
+    in += 4;
+  }
+  return (w+5);
+}
+
+static void iem_pow4_tilde_dsp(t_iem_pow4_tilde *x, t_signal **sp)
+{
+  dsp_add(iem_pow4_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void *iem_pow4_tilde_new(t_floatarg f)
+{
+  t_iem_pow4_tilde *x = (t_iem_pow4_tilde *)pd_new(iem_pow4_tilde_class);
+  
+  x->x_exp = f;
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  outlet_new(&x->x_obj, gensym("signal"));
+  x->x_msi = 0;
+  return (x);
+}
+
+void iem_pow4_tilde_setup(void)
+{
+  iem_pow4_tilde_class = class_new(gensym("iem_pow4~"), (t_newmethod)iem_pow4_tilde_new, 0,
+    sizeof(t_iem_pow4_tilde), 0, A_DEFFLOAT, 0);
+  class_addcreator((t_newmethod)iem_pow4_tilde_new, gensym("icot~"), 0);
+  CLASS_MAINSIGNALIN(iem_pow4_tilde_class, t_iem_pow4_tilde, x_msi);
+  class_addmethod(iem_pow4_tilde_class, (t_method)iem_pow4_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(iem_pow4_tilde_class, (t_method)iem_pow4_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+  class_sethelpsymbol(iem_pow4_tilde_class, gensym("iemhelp/help-iem_pow4~"));
+}
diff --git a/src/iemlib1/iem_sqrt4~.c b/src/iemlib1/iem_sqrt4~.c
new file mode 100644
index 0000000..d156122
--- /dev/null
+++ b/src/iemlib1/iem_sqrt4~.c
@@ -0,0 +1,108 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+#define IEMSQRT4TAB1SIZE 256
+#define IEMSQRT4TAB2SIZE 1024
+
+/* ------------------------ iem_sqrt4~ ----------------------------- */
+
+t_float *iem_sqrt4_tilde_exptab=(t_float *)0L;
+t_float *iem_sqrt4_tilde_mantissatab=(t_float *)0L;
+
+static t_class *iem_sqrt4_tilde_class;
+
+typedef struct _iem_sqrt4_tilde
+{
+  t_object  x_obj;
+  t_float   x_msi;
+} t_iem_sqrt4_tilde;
+
+static t_int *iem_sqrt4_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_int n = (t_int)(w[3])/4;
+  
+  while(n--)
+  {
+    t_float f = *in;
+    t_float g, h;
+    long l = *(long *)(in);
+    
+    if(f < 0.0f)
+    {
+      *out++ = 0.0f;
+      *out++ = 0.0f;
+      *out++ = 0.0f;
+      *out++ = 0.0f;
+    }
+    else
+    {
+      g = iem_sqrt4_tilde_exptab[(l >> 23) & 0xff] * iem_sqrt4_tilde_mantissatab[(l >> 13) & 0x3ff];
+      h = f * (1.5f * g - 0.5f * g * g * g * f);
+      *out++ = h;
+      *out++ = h;
+      *out++ = h;
+      *out++ = h;
+    }
+    in += 4;
+  }
+  return(w+4);
+}
+
+static void iem_sqrt4_tilde_dsp(t_iem_sqrt4_tilde *x, t_signal **sp)
+{
+  dsp_add(iem_sqrt4_tilde_perform, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+static void iem_sqrt4_tilde_maketable(void)
+{
+  int i;
+  t_float f;
+  long l;
+  
+  if(!iem_sqrt4_tilde_exptab)
+  {
+    iem_sqrt4_tilde_exptab = (t_float *)getbytes(sizeof(t_float) * IEMSQRT4TAB1SIZE);
+    for(i=0; i<IEMSQRT4TAB1SIZE; i++)
+    {
+      l = (i ? (i == IEMSQRT4TAB1SIZE-1 ? IEMSQRT4TAB1SIZE-2 : i) : 1)<< 23;
+      *(long *)(&f) = l;
+      iem_sqrt4_tilde_exptab[i] = 1.0f/sqrt(f); 
+    }
+  }
+  if(!iem_sqrt4_tilde_mantissatab)
+  {
+    iem_sqrt4_tilde_mantissatab = (t_float *)getbytes(sizeof(t_float) * IEMSQRT4TAB2SIZE);
+    for(i=0; i<IEMSQRT4TAB2SIZE; i++)
+    {
+      f = 1.0f + (1.0f/(t_float)IEMSQRT4TAB2SIZE) * (t_float)i;
+      iem_sqrt4_tilde_mantissatab[i] = 1.0f/sqrt(f);  
+    }
+  }
+}
+
+static void *iem_sqrt4_tilde_new(void)
+{
+  t_iem_sqrt4_tilde *x = (t_iem_sqrt4_tilde *)pd_new(iem_sqrt4_tilde_class);
+  
+  outlet_new(&x->x_obj, gensym("signal"));
+  x->x_msi = 0;
+  return (x);
+}
+
+void iem_sqrt4_tilde_setup(void)
+{
+  iem_sqrt4_tilde_class = class_new(gensym("iem_sqrt4~"), (t_newmethod)iem_sqrt4_tilde_new, 0,
+    sizeof(t_iem_sqrt4_tilde), 0, 0);
+  CLASS_MAINSIGNALIN(iem_sqrt4_tilde_class, t_iem_sqrt4_tilde, x_msi);
+  class_addmethod(iem_sqrt4_tilde_class, (t_method)iem_sqrt4_tilde_dsp, gensym("dsp"), 0);
+  iem_sqrt4_tilde_maketable();
+  class_sethelpsymbol(iem_sqrt4_tilde_class, gensym("iemhelp/help-iem_sqrt4~"));
+}
diff --git a/src/iemlib1/iemlib1.c b/src/iemlib1/iemlib1.c
index c2b4efb..517d0ea 100644
--- a/src/iemlib1/iemlib1.c
+++ b/src/iemlib1/iemlib1.c
@@ -3,11 +3,6 @@
 
 iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
 
-#ifdef _MSC_VER
-#pragma warning( disable : 4244 )
-#pragma warning( disable : 4305 )
-#endif
-
 
 #include "m_pd.h"
 #include "iemlib.h"
@@ -24,27 +19,27 @@ static void *iemlib1_new(void)
 void biquad_freq_resp_setup(void);
 void db2v_setup(void);
 void f2note_setup(void);
+void filter_tilde_setup(void);
+void FIR_tilde_setup(void);
 void forpp_setup(void);
 void gate_setup(void);
-void sigfilter_setup(void);
-void sigFIR_setup(void);
-void sighml_shelf_setup(void);
-void sigiem_cot4_setup(void);
-void sigiem_delay_setup(void);
-void sigiem_sqrt4_setup(void);
-void sigiem_pow4_setup(void);
-void siglp1_t_setup(void);
-void sigmov_avrg_kern_setup(void);
-void sigpara_bp2_setup(void);
-void sigpeakenv_setup(void);
-void sigprvu_setup(void);
-void sigpvu_setup(void);
-void sigrvu_setup(void);
-void sigsin_phase_setup(void);
-void sigvcf_filter_setup(void);
+void hml_shelf_tilde_setup(void);
+void iem_cot4_tilde_setup(void);
+void iem_delay_tilde_setup(void);
+void iem_pow4_tilde_setup(void);
+void iem_sqrt4_tilde_setup(void);
+void lp1_t_tilde_setup(void);
+void mov_avrg_kern_tilde_setup(void);
+void para_bp2_tilde_setup(void);
+void peakenv_tilde_setup(void);
+void prvu_tilde_setup(void);
+void pvu_tilde_setup(void);
+void rvu_tilde_setup(void);
+void sin_phase_tilde_setup(void);
 void soundfile_info_setup(void);
 void split_setup(void);
 void v2db_setup(void);
+void vcf_filter_tilde_setup(void);
 
 /* ------------------------ setup routine ------------------------- */
 
@@ -56,27 +51,27 @@ void iemlib1_setup(void)
   biquad_freq_resp_setup();
   db2v_setup();
   f2note_setup();
+  filter_tilde_setup();
+  FIR_tilde_setup();
   forpp_setup();
   gate_setup();
-  sigfilter_setup();
-  sigFIR_setup();
-  sighml_shelf_setup();
-  sigiem_cot4_setup();
-  sigiem_delay_setup();
-  sigiem_sqrt4_setup();
-  sigiem_pow4_setup();
-  siglp1_t_setup();
-  sigmov_avrg_kern_setup();
-  sigpara_bp2_setup();
-  sigpeakenv_setup();
-  sigprvu_setup();
-  sigpvu_setup();
-  sigrvu_setup();
-  sigsin_phase_setup();
-  sigvcf_filter_setup();
+  hml_shelf_tilde_setup();
+  iem_cot4_tilde_setup();
+  iem_delay_tilde_setup();
+  iem_pow4_tilde_setup();
+  iem_sqrt4_tilde_setup();
+  lp1_t_tilde_setup();
+  mov_avrg_kern_tilde_setup();
+  para_bp2_tilde_setup();
+  peakenv_tilde_setup();
+  prvu_tilde_setup();
+  pvu_tilde_setup();
+  rvu_tilde_setup();
+  sin_phase_tilde_setup();
   soundfile_info_setup();
   split_setup();
   v2db_setup();
+  vcf_filter_tilde_setup();
   
 	post("iemlib1 (R-1.16) library loaded!   (c) Thomas Musil 05.2005");
 	post("   musil%ciem.at iem KUG Graz Austria", '@');
diff --git a/src/iemlib1/lp1_t~.c b/src/iemlib1/lp1_t~.c
new file mode 100644
index 0000000..b7d7685
--- /dev/null
+++ b/src/iemlib1/lp1_t~.c
@@ -0,0 +1,210 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* -- lp1_t~ - slow dynamic lowpass-filter 1. order with tau input --- */
+
+typedef struct _lp1_t_tilde
+{
+  t_object  x_obj;
+  t_float   yn1;
+  t_float   c0;
+  t_float   c1;
+  t_float   sr;
+  t_float   cur_t;
+  t_float   delta_t;
+  t_float   end_t;
+  t_float   ticks_per_interpol_time;
+  t_float   rcp_ticks;
+  t_float   interpol_time;
+  int       ticks;
+  int       counter_t;
+  t_float   x_msi;
+} t_lp1_t_tilde;
+
+t_class *lp1_t_tilde_class;
+
+static void lp1_t_tilde_dsp_tick(t_lp1_t_tilde *x)
+{
+  if(x->counter_t)
+  {
+    if(x->counter_t <= 1)
+    {
+      x->cur_t = x->end_t;
+      x->counter_t = 0;
+    }
+    else
+    {
+      x->counter_t--;
+      x->cur_t += x->delta_t;
+    }
+    if(x->cur_t == 0.0f)
+      x->c1 = 0.0f;
+    else
+      x->c1 = exp((x->sr)/x->cur_t);
+    x->c0 = 1.0f - x->c1;
+  }
+}
+
+static t_int *lp1_t_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_lp1_t_tilde *x = (t_lp1_t_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float yn0, yn1=x->yn1;
+  t_float c0=x->c0, c1=x->c1;
+  
+  lp1_t_tilde_dsp_tick(x);
+  for(i=0; i<n; i++)
+  {
+    yn0 = (*in++)*c0 + yn1*c1;
+    *out++ = yn0;
+    yn1 = yn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(yn1))
+    yn1 = 0.0f;
+  x->yn1 = yn1;
+  return(w+5);
+}
+
+static t_int *lp1_t_tilde_perf8(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_lp1_t_tilde *x = (t_lp1_t_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float yn[9];
+  t_float c0=x->c0, c1=x->c1;
+  
+  lp1_t_tilde_dsp_tick(x);
+  yn[0] = x->yn1;
+  for(i=0; i<n; i+=8, in+=8, out+=8)
+  {
+    yn[1] = in[0]*c0 + yn[0]*c1;
+    out[0] = yn[1];
+    yn[2] = in[1]*c0 + yn[1]*c1;
+    out[1] = yn[2];
+    yn[3] = in[2]*c0 + yn[2]*c1;
+    out[2] = yn[3];
+    yn[4] = in[3]*c0 + yn[3]*c1;
+    out[3] = yn[4];
+    yn[5] = in[4]*c0 + yn[4]*c1;
+    out[4] = yn[5];
+    yn[6] = in[5]*c0 + yn[5]*c1;
+    out[5] = yn[6];
+    yn[7] = in[6]*c0 + yn[6]*c1;
+    out[6] = yn[7];
+    yn[8] = in[7]*c0 + yn[7]*c1;
+    out[7] = yn[8];
+    yn[0] = yn[8];
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(yn[0]))
+    yn[0] = 0.0f;
+  
+  x->yn1 = yn[0];
+  return(w+5);
+}
+
+static void lp1_t_tilde_ft2(t_lp1_t_tilde *x, t_floatarg t)
+{
+  int i = (int)((x->ticks_per_interpol_time)*t);
+  
+  x->interpol_time = t;
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+}
+
+static void lp1_t_tilde_ft1(t_lp1_t_tilde *x, t_floatarg time_const)
+{
+  if(time_const < 0.0f)
+    time_const = 0.0f;
+  if(time_const != x->cur_t)
+  {
+    x->end_t = time_const;
+    x->counter_t = x->ticks;
+    x->delta_t = (time_const - x->cur_t) * x->rcp_ticks;
+  }
+}
+
+static void lp1_t_tilde_dsp(t_lp1_t_tilde *x, t_signal **sp)
+{
+  int i, n=(int)sp[0]->s_n;
+  
+  x->sr = -1000.0f / (t_float)(sp[0]->s_sr);
+  x->ticks_per_interpol_time = 0.001f * (t_float)(sp[0]->s_sr) / (t_float)n;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+  if(x->cur_t == 0.0f)
+    x->c1 = 0.0f;
+  else
+    x->c1 = exp((x->sr)/x->cur_t);
+  x->c0 = 1.0f - x->c1;
+  if(n&7)
+    dsp_add(lp1_t_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+  else
+    dsp_add(lp1_t_tilde_perf8, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+}
+
+static void *lp1_t_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_lp1_t_tilde *x = (t_lp1_t_tilde *)pd_new(lp1_t_tilde_class);
+  int i;
+  t_float time_const=0.0f, interpol=0.0f;
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft2"));
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_msi = 0;
+  x->counter_t = 1;
+  x->delta_t = 0.0f;
+  x->interpol_time = 0.0f;
+  x->yn1 = 0.0f;
+  x->sr = -1.0f / 44.1f;
+  if((argc >= 1)&&IS_A_FLOAT(argv,0))
+    time_const = (t_float)atom_getfloatarg(0, argc, argv);
+  if((argc >= 2)&&IS_A_FLOAT(argv,1))
+    interpol = (t_float)atom_getfloatarg(1, argc, argv);
+  if(time_const < 0.0f)
+    time_const = 0.0f;
+  x->cur_t = time_const;
+  if(time_const == 0.0f)
+    x->c1 = 0.0f;
+  else
+    x->c1 = exp((x->sr)/time_const);
+  x->c0 = 1.0f - x->c1;
+  if(interpol < 0.0f)
+    interpol = 0.0f;
+  x->interpol_time = interpol;
+  x->ticks_per_interpol_time = 0.5f;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+  x->end_t = x->cur_t;
+  return (x);
+}
+
+void lp1_t_tilde_setup(void)
+{
+  lp1_t_tilde_class = class_new(gensym("lp1_t~"), (t_newmethod)lp1_t_tilde_new,
+        0, sizeof(t_lp1_t_tilde), 0, A_GIMME, 0);
+  CLASS_MAINSIGNALIN(lp1_t_tilde_class, t_lp1_t_tilde, x_msi);
+  class_addmethod(lp1_t_tilde_class, (t_method)lp1_t_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(lp1_t_tilde_class, (t_method)lp1_t_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+  class_addmethod(lp1_t_tilde_class, (t_method)lp1_t_tilde_ft2, gensym("ft2"), A_FLOAT, 0);
+  class_sethelpsymbol(lp1_t_tilde_class, gensym("iemhelp/help-lp1_t~"));
+}
diff --git a/src/iemlib1/makefile_linux b/src/iemlib1/makefile_linux
new file mode 100644
index 0000000..5d7ecfc
--- /dev/null
+++ b/src/iemlib1/makefile_linux
@@ -0,0 +1,69 @@
+current: all
+
+.SUFFIXES: .pd_linux
+
+INCLUDE = -I. -I/usr/local/src/pd/src
+
+LDFLAGS = -export-dynamic -shared
+LIB = -ldl -lm -lpthread
+
+#select either the DBG and OPT compiler flags below:
+
+CFLAGS = -DPD -DUNIX -W -Werror -Wno-unused \
+	-Wno-parentheses -Wno-switch -O6 -funroll-loops -fomit-frame-pointer -fno-strict-aliasing \
+        -DDL_OPEN
+
+SYSTEM = $(shell uname -m)
+
+# the sources
+
+SRC = 	biquad_freq_resp.c \
+	db2v.c \
+	f2note.c \
+	filter~.c \
+	FIR~.c \
+	forpp.c \
+	gate.c \
+	hml_shelf~.c \
+	iem_cot4~.c \
+	iem_delay~.c \
+	iem_pow4~.c \
+	iem_sqrt4~.c \
+	lp1_t~.c \
+	mov_avrg_kern~.c \
+	para_bp2~.c \
+	peakenv~.c \
+	prvu~.c \
+	pvu~.c \
+	rvu~.c \
+	sin_phase~.c \
+	soundfile_info.c \
+	split.c \
+	v2db.c \
+	vcf_filter~.c \
+	iemlib2.c
+
+TARGET = iemlib1.pd_linux
+
+
+OBJ = $(SRC:.c=.o) 
+
+#
+#  ------------------ targets ------------------------------------
+#
+
+clean:
+	rm $(TARGET)
+	rm *.o
+
+all: $(OBJ)
+	@echo :: $(OBJ)
+	$(LD) $(LDFLAGS) -o $(TARGET) *.o $(LIB)
+	strip --strip-unneeded $(TARGET)
+
+$(OBJ) : %.o : %.c
+	$(CC) $(CFLAGS) $(INCLUDE) -c -o $*.o $*.c
+
+
+
+
diff --git a/src/iemlib1/makefile_win b/src/iemlib1/makefile_win
index 2997352..cd4322d 100644
--- a/src/iemlib1/makefile_win
+++ b/src/iemlib1/makefile_win
@@ -18,27 +18,27 @@ PD_WIN_LIB = /NODEFAULTLIB:libc /NODEFAULTLIB:oldnames /NODEFAULTLIB:kernel /NOD
 SRC =	biquad_freq_resp.c \
 		db2v.c \
 		f2note.c \
+		filter~.c \
+		FIR~.c \
 		forpp.c \
 		gate.c \
-		sigfilter.c \
-		sigFIR.c \
-		sighml_shelf.c \
-		sigiem_cot4.c \
-		sigiem_delay.c \
-		sigiem_sqrt4.c \
-		sigiem_pow4.c \
-		siglp1_t.c \
-		sigmov_avrg_kern.c \
-		sigpara_bp2.c \
-		sigpeakenv.c \
-		sigprvu.c \
-		sigpvu.c \
-		sigrvu.c \
-		sigsin_phase.c \
-		sigvcf_filter.c \
+		hml_shelf~.c \
+		iem_cot4~.c \
+		iem_delay~.c \
+		iem_pow4~.c \
+		iem_sqrt4~.c \
+		lp1_t~.c \
+		mov_avrg_kern~.c \
+		para_bp2~.c \
+		peakenv~.c \
+		prvu~.c \
+		pvu~.c \
+		rvu~.c \
+		sin_phase~.c \
 		soundfile_info.c \
 		split.c \
 		v2db.c \
+		vcf_filter~.c \
 		iemlib1.c
 
 
diff --git a/src/iemlib1/mov_avrg_kern~.c b/src/iemlib1/mov_avrg_kern~.c
new file mode 100644
index 0000000..0d1147e
--- /dev/null
+++ b/src/iemlib1/mov_avrg_kern~.c
@@ -0,0 +1,135 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+
+#include "m_pd.h"
+#include "iemlib.h"
+
+
+/* -- mov_avrg_kern~ - kernel for a moving-average-filter with IIR - */
+
+typedef struct _mov_avrg_kern_tilde
+{
+  t_object x_obj;
+  double   x_wn1;
+  double   x_a0;
+  double   x_sr;
+  double   x_mstime;
+  int      x_nsamps;
+  int      x_counter;
+  t_float  x_msi;
+} t_mov_avrg_kern_tilde;
+
+t_class *mov_avrg_kern_tilde_class;
+
+static t_int *mov_avrg_kern_tilde_perform(t_int *w)
+{
+  t_float *in_direct = (t_float *)(w[1]);
+  t_float *in_delayed = (t_float *)(w[2]);
+  t_float *out = (t_float *)(w[3]);
+  t_mov_avrg_kern_tilde *x = (t_mov_avrg_kern_tilde *)(w[4]);
+  int i, n = (int)(w[5]);
+  double wn0, wn1=x->x_wn1, a0=x->x_a0;
+  
+  if(x->x_counter)
+  {
+    int counter = x->x_counter;
+    
+    if(counter >= n)
+    {
+      x->x_counter = counter - n;
+      for(i=0; i<n; i++)
+      {
+        wn0 = wn1 + a0*(double)(*in_direct++);
+        *out++ = (t_float)wn0;
+        wn1 = wn0;
+      }
+    }
+    else
+    {
+      x->x_counter = 0;
+      for(i=0; i<counter; i++)
+      {
+        wn0 = wn1 + a0*(double)(*in_direct++);
+        *out++ = (t_float)wn0;
+        wn1 = wn0;
+      }
+      for(i=counter; i<n; i++)
+      {
+        wn0 = wn1 + a0*(double)(*in_direct++ - *in_delayed++);
+        *out++ = (t_float)wn0;
+        wn1 = wn0;
+      }
+    }
+  }
+  else
+  {
+    for(i=0; i<n; i++)
+    {
+      wn0 = wn1 + a0*(double)(*in_direct++ - *in_delayed++);
+      *out++ = (t_float)wn0;
+      wn1 = wn0;
+    }
+  }
+  x->x_wn1 = wn1;
+  return(w+6);
+}
+
+static void mov_avrg_kern_tilde_ft1(t_mov_avrg_kern_tilde *x, t_floatarg mstime)
+{
+  if(mstime < 0.04)
+    mstime = 0.04;
+  x->x_mstime = (double)mstime;
+  x->x_nsamps = (int)(x->x_sr * x->x_mstime);
+  x->x_counter = x->x_nsamps;
+  x->x_wn1 = 0.0;
+  x->x_a0 = 1.0/(double)(x->x_nsamps);
+}
+
+static void mov_avrg_kern_tilde_reset(t_mov_avrg_kern_tilde *x)
+{
+  x->x_counter = x->x_nsamps;
+  x->x_wn1 = 0.0;
+}
+
+static void mov_avrg_kern_tilde_dsp(t_mov_avrg_kern_tilde *x, t_signal **sp)
+{
+  x->x_sr = 0.001*(double)(sp[0]->s_sr);
+  x->x_nsamps = (int)(x->x_sr * x->x_mstime);
+  x->x_counter = x->x_nsamps;
+  x->x_wn1 = 0.0;
+  x->x_a0 = 1.0/(double)(x->x_nsamps);
+  dsp_add(mov_avrg_kern_tilde_perform, 5, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, x, sp[0]->s_n);
+}
+
+static void *mov_avrg_kern_tilde_new(t_floatarg mstime)
+{
+  t_mov_avrg_kern_tilde *x = (t_mov_avrg_kern_tilde *)pd_new(mov_avrg_kern_tilde_class);
+  
+  if(mstime < 0.04)
+    mstime = 0.04;
+  x->x_mstime = (double)mstime;
+  x->x_sr = 44.1;
+  x->x_nsamps = (int)(x->x_sr * x->x_mstime);
+  x->x_counter = x->x_nsamps;
+  x->x_wn1 = 0.0;
+  x->x_a0 = 1.0/(double)(x->x_nsamps);
+  
+  inlet_new(&x->x_obj,  &x->x_obj.ob_pd, &s_signal, &s_signal);
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_msi = 0;
+  return(x);
+}
+
+void mov_avrg_kern_tilde_setup(void)
+{
+  mov_avrg_kern_tilde_class = class_new(gensym("mov_avrg_kern~"), (t_newmethod)mov_avrg_kern_tilde_new,
+        0, sizeof(t_mov_avrg_kern_tilde), 0, A_FLOAT, 0);
+  CLASS_MAINSIGNALIN(mov_avrg_kern_tilde_class, t_mov_avrg_kern_tilde, x_msi);
+  class_addmethod(mov_avrg_kern_tilde_class, (t_method)mov_avrg_kern_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(mov_avrg_kern_tilde_class, (t_method)mov_avrg_kern_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+  class_addmethod(mov_avrg_kern_tilde_class, (t_method)mov_avrg_kern_tilde_reset, gensym("reset"), 0);
+}
diff --git a/src/iemlib1/para_bp2~.c b/src/iemlib1/para_bp2~.c
new file mode 100644
index 0000000..0cf7771
--- /dev/null
+++ b/src/iemlib1/para_bp2~.c
@@ -0,0 +1,418 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+
+/* ---------- para_bp2~ - parametric bandpass 2. order ----------- */
+
+typedef struct _para_bp2_tilde
+{
+  t_object x_obj;
+  t_float  wn1;
+  t_float  wn2;
+  t_float  a0;
+  t_float  a1;
+  t_float  a2;
+  t_float  b1;
+  t_float  b2;
+  t_float  sr;
+  t_float  cur_f;
+  t_float  cur_l;
+  t_float  cur_a;
+  t_float  cur_g;
+  t_float  delta_f;
+  t_float  delta_a;
+  t_float  delta_g;
+  t_float  end_f;
+  t_float  end_a;
+  t_float  end_g;
+  t_float  ticks_per_interpol_time;
+  t_float  rcp_ticks;
+  t_float  interpol_time;
+  int      ticks;
+  int      counter_f;
+  int      counter_a;
+  int      counter_g;
+  int      event_mask;
+  void     *x_debug_outlet;
+  t_atom   x_at[5];
+  t_float  x_msi;
+} t_para_bp2_tilde;
+
+t_class *para_bp2_tilde_class;
+
+static void para_bp2_tilde_calc(t_para_bp2_tilde *x)
+{
+  t_float l, al, gal, l2, rcp;
+  
+  l = x->cur_l;
+  l2 = l*l + 1.0f;
+  al = l*x->cur_a;
+  gal = al*x->cur_g;
+  rcp = 1.0f/(al + l2);
+  x->a0 = rcp*(l2 + gal);
+  x->a1 = rcp*2.0f*(2.0f - l2);
+  x->a2 = rcp*(l2 - gal);
+  x->b1 = -x->a1;
+  x->b2 = rcp*(al - l2);
+}
+
+static void para_bp2_tilde_dsp_tick(t_para_bp2_tilde *x)
+{
+  if(x->event_mask)
+  {
+    t_float discriminant;
+    
+    if(x->counter_f)
+    {
+      t_float l, si, co;
+      
+      if(x->counter_f <= 1)
+      {
+        x->cur_f = x->end_f;
+        x->counter_f = 0;
+        x->event_mask &= 6;/*set event_mask_bit 0 = 0*/
+      }
+      else
+      {
+        x->counter_f--;
+        x->cur_f *= x->delta_f;
+      }
+      l = x->cur_f * x->sr;
+      if(l < 1.0e-20f)
+        x->cur_l = 1.0e20f;
+      else if(l > 1.57079632f)
+        x->cur_l = 0.0f;
+      else
+      {
+        si = sin(l);
+        co = cos(l);
+        x->cur_l = co/si;
+      }
+    }
+    if(x->counter_a)
+    {
+      if(x->counter_a <= 1)
+      {
+        x->cur_a = x->end_a;
+        x->counter_a = 0;
+        x->event_mask &= 5;/*set event_mask_bit 1 = 0*/
+      }
+      else
+      {
+        x->counter_a--;
+        x->cur_a *= x->delta_a;
+      }
+    }
+    if(x->counter_g)
+    {
+      if(x->counter_g <= 1)
+      {
+        x->cur_g = x->end_g;
+        x->counter_g = 0;
+        x->event_mask &= 3;/*set event_mask_bit 2 = 0*/
+      }
+      else
+      {
+        x->counter_g--;
+        x->cur_g *= x->delta_g;
+      }
+    }
+    
+    para_bp2_tilde_calc(x);
+    
+    /* stability check */
+    
+    discriminant = x->b1 * x->b1 + 4.0f * x->b2;
+    if(x->b1 <= -1.9999996f)
+      x->b1 = -1.9999996f;
+    else if(x->b1 >= 1.9999996f)
+      x->b1 = 1.9999996f;
+    
+    if(x->b2 <= -0.9999998f)
+      x->b2 = -0.9999998f;
+    else if(x->b2 >= 0.9999998f)
+      x->b2 = 0.9999998f;
+    
+    if(discriminant >= 0.0f)
+    {
+      if(0.9999998f - x->b1 - x->b2 < 0.0f)
+        x->b2 = 0.9999998f - x->b1;
+      if(0.9999998f + x->b1 - x->b2 < 0.0f)
+        x->b2 = 0.9999998f + x->b1;
+    }
+  }
+}
+
+static t_int *para_bp2_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_para_bp2_tilde *x = (t_para_bp2_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float wn0, wn1=x->wn1, wn2=x->wn2;
+  t_float a0=x->a0, a1=x->a1, a2=x->a2;
+  t_float b1=x->b1, b2=x->b2;
+  
+  para_bp2_tilde_dsp_tick(x);
+  for(i=0; i<n; i++)
+  {
+    wn0 = *in++ + b1*wn1 + b2*wn2;
+    *out++ = a0*wn0 + a1*wn1 + a2*wn2;
+    wn2 = wn1;
+    wn1 = wn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn2))
+    wn2 = 0.0f;
+  if(IEM_DENORMAL(wn1))
+    wn1 = 0.0f;
+  
+  x->wn1 = wn1;
+  x->wn2 = wn2;
+  return(w+5);
+}
+/*   yn0 = *out;
+xn0 = *in;
+*************
+yn0 = a0*xn0 + a1*xn1 + a2*xn2 + b1*yn1 + b2*yn2;
+yn2 = yn1;
+yn1 = yn0;
+xn2 = xn1;
+xn1 = xn0;
+*************************
+y/x = (a0 + a1*z-1 + a2*z-2)/(1 - b1*z-1 - b2*z-2);*/
+
+static t_int *para_bp2_tilde_perf8(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_para_bp2_tilde *x = (t_para_bp2_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float wn[10];
+  t_float a0=x->a0, a1=x->a1, a2=x->a2;
+  t_float b1=x->b1, b2=x->b2;
+  
+  para_bp2_tilde_dsp_tick(x);
+  wn[0] = x->wn2;
+  wn[1] = x->wn1;
+  for(i=0; i<n; i+=8, in+=8, out+=8)
+  {
+    wn[2] = in[0] + b1*wn[1] + b2*wn[0];
+    out[0] = a0*wn[2] + a1*wn[1] + a2*wn[0];
+    wn[3] = in[1] + b1*wn[2] + b2*wn[1];
+    out[1] = a0*wn[3] + a1*wn[2] + a2*wn[1];
+    wn[4] = in[2] + b1*wn[3] + b2*wn[2];
+    out[2] = a0*wn[4] + a1*wn[3] + a2*wn[2];
+    wn[5] = in[3] + b1*wn[4] + b2*wn[3];
+    out[3] = a0*wn[5] + a1*wn[4] + a2*wn[3];
+    wn[6] = in[4] + b1*wn[5] + b2*wn[4];
+    out[4] = a0*wn[6] + a1*wn[5] + a2*wn[4];
+    wn[7] = in[5] + b1*wn[6] + b2*wn[5];
+    out[5] = a0*wn[7] + a1*wn[6] + a2*wn[5];
+    wn[8] = in[6] + b1*wn[7] + b2*wn[6];
+    out[6] = a0*wn[8] + a1*wn[7] + a2*wn[6];
+    wn[9] = in[7] + b1*wn[8] + b2*wn[7];
+    out[7] = a0*wn[9] + a1*wn[8] + a2*wn[7];
+    wn[0] = wn[8];
+    wn[1] = wn[9];
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn[0]))
+    wn[0] = 0.0f;
+  if(IEM_DENORMAL(wn[1]))
+    wn[1] = 0.0f;
+  
+  x->wn1 = wn[1];
+  x->wn2 = wn[0];
+  return(w+5);
+}
+
+static void para_bp2_tilde_ft4(t_para_bp2_tilde *x, t_floatarg t)
+{
+  int i = (int)((x->ticks_per_interpol_time)*t);
+  
+  x->interpol_time = t;
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+}
+
+static void para_bp2_tilde_ft3(t_para_bp2_tilde *x, t_floatarg l)
+{
+  t_float g = exp(0.11512925465 * l);
+  
+  if(g != x->cur_g)
+  {
+    x->end_g = g;
+    x->counter_g = x->ticks;
+    x->delta_g = exp(log(g/x->cur_g)*x->rcp_ticks);
+    x->event_mask |= 4;/*set event_mask_bit 2 = 1*/
+  }
+}
+
+static void para_bp2_tilde_ft2(t_para_bp2_tilde *x, t_floatarg q)
+{
+  t_float a;
+  
+  if(q <= 0.0f)
+    q = 0.000001f;
+  a = 1.0f/q;
+  if(a != x->cur_a)
+  {
+    x->end_a = a;
+    x->counter_a = x->ticks;
+    x->delta_a = exp(log(a/x->cur_a)*x->rcp_ticks);
+    x->event_mask |= 2;/*set event_mask_bit 1 = 1*/
+  }
+}
+
+static void para_bp2_tilde_ft1(t_para_bp2_tilde *x, t_floatarg f)
+{
+  if(f <= 0.0f)
+    f = 0.000001f;
+  if(f != x->cur_f)
+  {
+    x->end_f = f;
+    x->counter_f = x->ticks;
+    x->delta_f = exp(log(f/x->cur_f)*x->rcp_ticks);
+    x->event_mask |= 1;/*set event_mask_bit 0 = 1*/
+  }
+}
+
+static void para_bp2_tilde_print(t_para_bp2_tilde *x)
+{
+  //  post("fb1 = %g, fb2 = %g, ff1 = %g, ff2 = %g, ff3 = %g", x->b1, x->b2, x->a0, x->a1, x->a2);
+  x->x_at[0].a_w.w_float = x->b1;
+  x->x_at[1].a_w.w_float = x->b2;
+  x->x_at[2].a_w.w_float = x->a0;
+  x->x_at[3].a_w.w_float = x->a1;
+  x->x_at[4].a_w.w_float = x->a2;
+  outlet_list(x->x_debug_outlet, &s_list, 5, x->x_at);
+}
+
+static void para_bp2_tilde_dsp(t_para_bp2_tilde *x, t_signal **sp)
+{
+  t_float si, co, f;
+  int i, n=(int)sp[0]->s_n;
+  
+  x->sr = 3.14159265358979323846f / (t_float)(sp[0]->s_sr);
+  x->ticks_per_interpol_time = 0.001f * (t_float)(sp[0]->s_sr) / (t_float)n;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+  f = x->cur_f * x->sr;
+  if(f < 1.0e-20f)
+    x->cur_l = 1.0e20f;
+  else if(f > 1.57079632f)
+    x->cur_l = 0.0f;
+  else
+  {
+    si = sin(f);
+    co = cos(f);
+    x->cur_l = co/si;
+  }
+  if(n&7)
+    dsp_add(para_bp2_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+  else
+    dsp_add(para_bp2_tilde_perf8, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+}
+
+static void *para_bp2_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_para_bp2_tilde *x = (t_para_bp2_tilde *)pd_new(para_bp2_tilde_class);
+  int i;
+  t_float si, co, f=0.0f, q=1.0f, l=0.0f, interpol=0.0f;
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft2"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft3"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft4"));
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_debug_outlet = outlet_new(&x->x_obj, &s_list);
+  x->x_msi = 0;
+  
+  x->x_at[0].a_type = A_FLOAT;
+  x->x_at[1].a_type = A_FLOAT;
+  x->x_at[2].a_type = A_FLOAT;
+  x->x_at[3].a_type = A_FLOAT;
+  x->x_at[4].a_type = A_FLOAT;
+  
+  x->event_mask = 1;
+  x->counter_f = 1;
+  x->counter_a = 0;
+  x->counter_g = 0;
+  x->delta_f = 0.0f;
+  x->delta_a = 0.0f;
+  x->delta_g = 0.0f;
+  x->interpol_time = 500.0f;
+  x->wn1 = 0.0f;
+  x->wn2 = 0.0f;
+  x->a0 = 0.0f;
+  x->a1 = 0.0f;
+  x->a2 = 0.0f;
+  x->b1 = 0.0f;
+  x->b2 = 0.0f;
+  x->sr = 3.14159265358979323846f / 44100.0f;
+  x->cur_a = 1.0f;
+  if((argc == 4)&&IS_A_FLOAT(argv,3)&&IS_A_FLOAT(argv,2)&&IS_A_FLOAT(argv,1)&&IS_A_FLOAT(argv,0))
+  {
+    f = (t_float)atom_getfloatarg(0, argc, argv);
+    q = (t_float)atom_getfloatarg(1, argc, argv);
+    l = (t_float)atom_getfloatarg(2, argc, argv);
+    interpol = (t_float)atom_getfloatarg(3, argc, argv);
+  }
+  if(f <= 0.0f)
+    f = 0.000001f;
+  x->cur_f = f;
+  f *= x->sr;
+  if(f < 1.0e-20f)
+    x->cur_l = 1.0e20f;
+  else if(f > 1.57079632f)
+    x->cur_l = 0.0f;
+  else
+  {
+    si = sin(f);
+    co = cos(f);
+    x->cur_l = co/si;
+  }
+  if(q <= 0.0f)
+    q = 0.000001f;
+  x->cur_a = 1.0f/q;
+  x->cur_g = exp(0.11512925465 * l);
+  if(interpol <= 0.0f)
+    interpol = 0.0f;
+  x->interpol_time = interpol;
+  x->ticks_per_interpol_time = 0.5f;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+  x->end_f = x->cur_f;
+  x->end_a = x->cur_a;
+  x->end_g = x->cur_g;
+  return(x);
+}
+
+void para_bp2_tilde_setup(void)
+{
+  para_bp2_tilde_class = class_new(gensym("para_bp2~"), (t_newmethod)para_bp2_tilde_new,
+        0, sizeof(t_para_bp2_tilde), 0, A_GIMME, 0);
+  CLASS_MAINSIGNALIN(para_bp2_tilde_class, t_para_bp2_tilde, x_msi);
+  class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+  class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_ft2, gensym("ft2"), A_FLOAT, 0);
+  class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_ft3, gensym("ft3"), A_FLOAT, 0);
+  class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_ft4, gensym("ft4"), A_FLOAT, 0);
+  class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_print, gensym("print"), 0);
+  class_sethelpsymbol(para_bp2_tilde_class, gensym("iemhelp/help-para_bp2~"));
+}
diff --git a/src/iemlib1/peakenv~.c b/src/iemlib1/peakenv~.c
new file mode 100644
index 0000000..d5d212b
--- /dev/null
+++ b/src/iemlib1/peakenv~.c
@@ -0,0 +1,95 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ---------------- peakenv~ - simple peak-envelope-converter. ----------------- */
+
+typedef struct _peakenv_tilde
+{
+  t_object x_obj;
+  t_float  x_sr;
+  t_float  x_old_peak;
+  t_float  x_c1;
+  t_float  x_releasetime;
+  t_float  x_msi;
+} t_peakenv_tilde;
+
+t_class *peakenv_tilde_class;
+
+static void peakenv_tilde_reset(t_peakenv_tilde *x)
+{
+  x->x_old_peak = 0.0f;
+}
+
+static void peakenv_tilde_ft1(t_peakenv_tilde *x, t_floatarg f)/* release-time in ms */
+{
+  if(f < 0.0f)
+    f = 0.0f;
+  x->x_releasetime = f;
+  x->x_c1 = exp(-1.0/(x->x_sr*0.001*x->x_releasetime));
+}
+
+static t_int *peakenv_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_peakenv_tilde *x = (t_peakenv_tilde *)(w[3]);
+  int n = (int)(w[4]);
+  t_float peak = x->x_old_peak;
+  t_float c1 = x->x_c1;
+  t_float absolute;
+  int i;
+  
+  for(i=0; i<n; i++)
+  {
+    absolute = fabs(*in++);
+    peak *= c1;
+    if(absolute > peak)
+      peak = absolute;
+    *out++ = peak;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(peak))
+    peak = 0.0f;
+  x->x_old_peak = peak;
+  return(w+5);
+}
+
+static void peakenv_tilde_dsp(t_peakenv_tilde *x, t_signal **sp)
+{
+  x->x_sr = (t_float)sp[0]->s_sr;
+  peakenv_tilde_ft1(x, x->x_releasetime);
+  dsp_add(peakenv_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void *peakenv_tilde_new(t_floatarg f)
+{
+  t_peakenv_tilde *x = (t_peakenv_tilde *)pd_new(peakenv_tilde_class);
+  
+  if(f <= 0.0f)
+    f = 0.0f;
+  x->x_sr = 44100.0f;
+  peakenv_tilde_ft1(x, f);
+  x->x_old_peak = 0.0f;
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_msi = 0;
+  return(x);
+}
+
+void peakenv_tilde_setup(void)
+{
+  peakenv_tilde_class = class_new(gensym("peakenv~"), (t_newmethod)peakenv_tilde_new,
+    0, sizeof(t_peakenv_tilde), 0, A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(peakenv_tilde_class, t_peakenv_tilde, x_msi);
+  class_addmethod(peakenv_tilde_class, (t_method)peakenv_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(peakenv_tilde_class, (t_method)peakenv_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+  class_addmethod(peakenv_tilde_class, (t_method)peakenv_tilde_reset, gensym("reset"), 0);
+  class_sethelpsymbol(peakenv_tilde_class, gensym("iemhelp/help-peakenv~"));
+}
diff --git a/src/iemlib1/prvu~.c b/src/iemlib1/prvu~.c
new file mode 100644
index 0000000..17fe143
--- /dev/null
+++ b/src/iemlib1/prvu~.c
@@ -0,0 +1,274 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ---------------- prvu~ - simple peak&rms-vu-meter. ----------------- */
+
+typedef struct _prvu_tilde
+{
+  t_object  x_obj;
+  t_atom    x_at[3];
+  void      *x_clock_metro;
+  t_float   x_metro_time;
+  void      *x_clock_hold;
+  t_float   x_hold_time;
+  t_float   x_cur_peak;
+  t_float   x_old_peak;
+  t_float   x_hold_peak;
+  int       x_hold;
+  t_float   x_sum_rms;
+  t_float   x_old_rms;
+  t_float   x_rcp;
+  t_float   x_sr;
+  t_float   x_threshold_over;
+  int       x_overflow_counter;
+  t_float   x_release_time;
+  t_float   x_c1;
+  int       x_started;
+  t_float   x_msi;
+} t_prvu_tilde;
+
+t_class *prvu_tilde_class;
+static void prvu_tilde_tick_metro(t_prvu_tilde *x);
+static void prvu_tilde_tick_hold(t_prvu_tilde *x);
+
+static void prvu_tilde_reset(t_prvu_tilde *x)
+{
+  x->x_at[0].a_w.w_float = -99.9f;
+  x->x_at[1].a_w.w_float = -99.9f;
+  x->x_at[2].a_w.w_float = 0.0f;
+  outlet_list(x->x_obj.ob_outlet, &s_list, 3, x->x_at);
+  x->x_overflow_counter = 0;
+  x->x_cur_peak = 0.0f;
+  x->x_old_peak = 0.0f;
+  x->x_hold_peak = 0.0f;
+  x->x_sum_rms = 0.0f;
+  x->x_old_rms = 0.0f;
+  x->x_hold = 0;
+  clock_unset(x->x_clock_hold);
+  clock_delay(x->x_clock_metro, x->x_metro_time);
+}
+
+static void prvu_tilde_stop(t_prvu_tilde *x)
+{
+  clock_unset(x->x_clock_metro);
+  x->x_started = 0;
+}
+
+static void prvu_tilde_start(t_prvu_tilde *x)
+{
+  clock_delay(x->x_clock_metro, x->x_metro_time);
+  x->x_started = 1;
+}
+
+static void prvu_tilde_float(t_prvu_tilde *x, t_floatarg f)
+{
+  if(f == 0.0)
+  {
+    clock_unset(x->x_clock_metro);
+    x->x_started = 0;
+  }
+  else
+  {
+    clock_delay(x->x_clock_metro, x->x_metro_time);
+    x->x_started = 1;
+  }
+}
+
+static void prvu_tilde_t_release(t_prvu_tilde *x, t_floatarg release_time)
+{
+  if(release_time <= 5.0f)
+    release_time = 5.0f;
+  x->x_release_time = release_time;
+  x->x_c1 = exp(-2.0f*x->x_metro_time/x->x_release_time);
+}
+
+static void prvu_tilde_t_metro(t_prvu_tilde *x, t_floatarg metro_time)
+{
+  if(metro_time <= 5.0f)
+    metro_time = 5.0f;
+  x->x_metro_time = metro_time;
+  x->x_c1 = exp(-2.0f*x->x_metro_time/x->x_release_time);
+  x->x_rcp = 1.0f/(x->x_sr*(t_float)x->x_metro_time);
+}
+
+static void prvu_tilde_t_hold(t_prvu_tilde *x, t_floatarg hold_time)
+{
+  if(hold_time <= 5.0f)
+    hold_time = 5.0f;
+  x->x_hold_time = hold_time;
+}
+
+static void prvu_tilde_threshold(t_prvu_tilde *x, t_floatarg thresh)
+{
+  x->x_threshold_over = thresh;
+}
+
+static t_int *prvu_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_prvu_tilde *x = (t_prvu_tilde *)(w[2]);
+  int n = (int)(w[3]);
+  t_float peak = x->x_cur_peak, pow, sum=x->x_sum_rms;
+  int i;
+  
+  if(x->x_started)
+  {
+    for(i=0; i<n; i++)
+    {
+      pow = in[i]*in[i];
+      if(pow > peak)
+        peak = pow;
+      sum += pow;
+    }
+    x->x_cur_peak = peak;
+    x->x_sum_rms = sum;
+  }
+  return(w+4);
+}
+
+static void prvu_tilde_dsp(t_prvu_tilde *x, t_signal **sp)
+{
+  x->x_sr = 0.001*(t_float)sp[0]->s_sr;
+  x->x_rcp = 1.0f/(x->x_sr*x->x_metro_time);
+  dsp_add(prvu_tilde_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
+  clock_delay(x->x_clock_metro, x->x_metro_time);
+}
+
+static void prvu_tilde_tick_hold(t_prvu_tilde *x)
+{
+  x->x_hold = 0;
+  x->x_hold_peak = x->x_old_peak;
+}
+
+static void prvu_tilde_tick_metro(t_prvu_tilde *x)
+{
+  t_float dbr, dbp, cur_rms, c1=x->x_c1;
+  
+  x->x_old_peak *= c1;
+  /* NAN protect */
+  if(IEM_DENORMAL(x->x_old_peak))
+    x->x_old_peak = 0.0f;
+  
+  if(x->x_cur_peak > x->x_old_peak)
+    x->x_old_peak = x->x_cur_peak;
+  if(x->x_old_peak > x->x_hold_peak)
+  {
+    x->x_hold = 1;
+    x->x_hold_peak = x->x_old_peak;
+    clock_delay(x->x_clock_hold, x->x_hold_time);
+  }
+  if(!x->x_hold)
+    x->x_hold_peak = x->x_old_peak;
+  if(x->x_hold_peak <= 0.0000000001f)
+    dbp = -99.9f;
+  else if(x->x_hold_peak > 1000000.0f)
+  {
+    dbp = 60.0f;
+    x->x_hold_peak = 1000000.0f;
+    x->x_old_peak = 1000000.0f;
+  }
+  else
+    dbp = 4.3429448195f*log(x->x_hold_peak);
+  x->x_cur_peak = 0.0f;
+  if(dbp >= x->x_threshold_over)
+    x->x_overflow_counter++;
+  x->x_at[1].a_w.w_float = dbp;
+  x->x_at[2].a_w.w_float = (t_float)x->x_overflow_counter;
+  
+  cur_rms = (1.0f - c1)*x->x_sum_rms*x->x_rcp + c1*x->x_old_rms;
+  /* NAN protect */
+  if(IEM_DENORMAL(cur_rms))
+    cur_rms = 0.0f;
+  
+  if(cur_rms <= 0.0000000001f)
+    dbr = -99.9f;
+  else if(cur_rms > 1000000.0f)
+  {
+    dbr = 60.0f;
+    x->x_old_rms = 1000000.0f;
+  }
+  else
+    dbr = 4.3429448195f*log(cur_rms);
+  x->x_sum_rms = 0.0f;
+  x->x_old_rms = cur_rms;
+  x->x_at[0].a_w.w_float = dbr;
+  outlet_list(x->x_obj.ob_outlet, &s_list, 3, x->x_at);
+  clock_delay(x->x_clock_metro, x->x_metro_time);
+}
+
+static void prvu_tilde_ff(t_prvu_tilde *x)
+{
+  clock_free(x->x_clock_metro);
+  clock_free(x->x_clock_hold);
+}
+
+static void *prvu_tilde_new(t_floatarg metro_time, t_floatarg hold_time,
+                         t_floatarg release_time, t_floatarg threshold)
+{
+  t_prvu_tilde *x;
+  t_float t;
+  int i;
+  
+  x = (t_prvu_tilde *)pd_new(prvu_tilde_class);
+  if(metro_time <= 0.0f)
+    metro_time = 300.0f;
+  if(metro_time <= 5.0f)
+    metro_time = 5.0f;
+  if(release_time <= 0.0f)
+    release_time = 300.0f;
+  if(release_time <= 5.0f)
+    release_time = 5.0f;
+  if(hold_time <= 0.0f)
+    hold_time = 1000.0f;
+  if(hold_time <= 5.0f)
+    hold_time = 5.0f;
+  if(threshold == 0.0f)
+    threshold = -0.01f;
+  x->x_metro_time = metro_time;
+  x->x_release_time = release_time;
+  x->x_hold_time = hold_time;
+  x->x_threshold_over = threshold;
+  x->x_c1 = exp(-2.0f*x->x_metro_time/x->x_release_time);
+  x->x_cur_peak = 0.0f;
+  x->x_old_peak = 0.0f;
+  x->x_hold_peak = 0.0f;
+  x->x_hold = 0;
+  x->x_sum_rms = 0.0f;
+  x->x_old_rms = 0.0f;
+  x->x_sr = 44.1f;
+  x->x_rcp = 1.0f/(x->x_sr*x->x_metro_time);
+  x->x_overflow_counter = 0;
+  x->x_clock_metro = clock_new(x, (t_method)prvu_tilde_tick_metro);
+  x->x_clock_hold = clock_new(x, (t_method)prvu_tilde_tick_hold);
+  x->x_started = 1;
+  outlet_new(&x->x_obj, &s_list);
+  x->x_at[0].a_type = A_FLOAT;
+  x->x_at[1].a_type = A_FLOAT;
+  x->x_at[2].a_type = A_FLOAT;
+  x->x_msi = 0.0f;
+  return(x);
+}
+
+void prvu_tilde_setup(void)
+{
+  prvu_tilde_class = class_new(gensym("prvu~"), (t_newmethod)prvu_tilde_new,
+    (t_method)prvu_tilde_ff, sizeof(t_prvu_tilde), 0,
+    A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(prvu_tilde_class, t_prvu_tilde, x_msi);
+  class_addmethod(prvu_tilde_class, (t_method)prvu_tilde_dsp, gensym("dsp"), 0);
+  class_addfloat(prvu_tilde_class, prvu_tilde_float);
+  class_addmethod(prvu_tilde_class, (t_method)prvu_tilde_reset, gensym("reset"), 0);
+  class_addmethod(prvu_tilde_class, (t_method)prvu_tilde_start, gensym("start"), 0);
+  class_addmethod(prvu_tilde_class, (t_method)prvu_tilde_stop, gensym("stop"), 0);
+  class_addmethod(prvu_tilde_class, (t_method)prvu_tilde_t_release, gensym("t_release"), A_FLOAT, 0);
+  class_addmethod(prvu_tilde_class, (t_method)prvu_tilde_t_metro, gensym("t_metro"), A_FLOAT, 0);
+  class_addmethod(prvu_tilde_class, (t_method)prvu_tilde_t_hold, gensym("t_hold"), A_FLOAT, 0);
+  class_addmethod(prvu_tilde_class, (t_method)prvu_tilde_threshold, gensym("threshold"), A_FLOAT, 0);
+  class_sethelpsymbol(prvu_tilde_class, gensym("iemhelp/help-prvu~"));
+}
diff --git a/src/iemlib1/pvu~.c b/src/iemlib1/pvu~.c
new file mode 100644
index 0000000..66e9437
--- /dev/null
+++ b/src/iemlib1/pvu~.c
@@ -0,0 +1,198 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ---------------- pvu~ - simple peak-vu-meter. ----------------- */
+
+typedef struct _pvu_tilde
+{
+  t_object  x_obj;
+  void      *x_outlet_meter;
+  void      *x_outlet_over;
+  void      *x_clock;
+  t_float   x_cur_peak;
+  t_float   x_old_peak;
+  t_float   x_threshold_over;
+  t_float   x_c1;
+  t_float   x_metro_time;
+  t_float   x_release_time;
+  int       x_overflow_counter;
+  int       x_started;
+  t_float   x_msi;
+} t_pvu_tilde;
+
+t_class *pvu_tilde_class;
+static void pvu_tilde_tick(t_pvu_tilde *x);
+
+static void pvu_tilde_reset(t_pvu_tilde *x)
+{
+  outlet_float(x->x_outlet_over, 0.0f);
+  outlet_float(x->x_outlet_meter, -199.9f);
+  x->x_overflow_counter = 0;
+  x->x_cur_peak = 0.0f;
+  x->x_old_peak = 0.0f;
+  clock_delay(x->x_clock, x->x_metro_time);
+}
+
+static void pvu_tilde_stop(t_pvu_tilde *x)
+{
+  clock_unset(x->x_clock);
+  x->x_started = 0;
+}
+
+static void pvu_tilde_start(t_pvu_tilde *x)
+{
+  clock_delay(x->x_clock, x->x_metro_time);
+  x->x_started = 1;
+}
+
+static void pvu_tilde_float(t_pvu_tilde *x, t_floatarg f)
+{
+  if(f == 0.0)
+  {
+    clock_unset(x->x_clock);
+    x->x_started = 0;
+  }
+  else
+  {
+    clock_delay(x->x_clock, x->x_metro_time);
+    x->x_started = 1;
+  }
+}
+
+static void pvu_tilde_t_release(t_pvu_tilde *x, t_floatarg release_time)
+{
+  if(release_time <= 5.0f)
+    release_time = 5.0f;
+  x->x_release_time = release_time;
+  x->x_c1 = exp(-x->x_metro_time/release_time);
+}
+
+static void pvu_tilde_t_metro(t_pvu_tilde *x, t_floatarg metro_time)
+{
+  if(metro_time <= 5.0f)
+    metro_time = 5.0f;
+  x->x_metro_time = (int)metro_time;
+  x->x_c1 = exp(-metro_time/x->x_release_time);
+}
+
+static void pvu_tilde_threshold(t_pvu_tilde *x, t_floatarg thresh)
+{
+  x->x_threshold_over = thresh;
+}
+
+static t_int *pvu_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_pvu_tilde *x = (t_pvu_tilde *)(w[2]);
+  int n = (int)(w[3]);
+  t_float peak = x->x_cur_peak;
+  t_float absolute;
+  int i;
+  
+  if(x->x_started)
+  {
+    for(i=0; i<n; i++)
+    {
+      absolute = fabs(*in++);
+      if(absolute > peak)
+        peak = absolute;
+    }
+    x->x_cur_peak = peak;
+  }
+  return(w+4);
+}
+
+static void pvu_tilde_dsp(t_pvu_tilde *x, t_signal **sp)
+{
+  dsp_add(pvu_tilde_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
+  clock_delay(x->x_clock, x->x_metro_time);
+}
+
+static void pvu_tilde_tick(t_pvu_tilde *x)
+{
+  t_float db;
+  int i;
+  
+  x->x_old_peak *= x->x_c1;
+  /* NAN protect */
+  if(IEM_DENORMAL(x->x_old_peak))
+    x->x_old_peak = 0.0f;
+  
+  if(x->x_cur_peak > x->x_old_peak)
+    x->x_old_peak = x->x_cur_peak;
+  if(x->x_old_peak <= 0.0000000001f)
+    db = -199.9f;
+  else if(x->x_old_peak > 1000000.0f)
+  {
+    db = 120.0f;
+    x->x_old_peak = 1000000.0f;
+  }
+  else
+    db = 8.6858896381f*log(x->x_old_peak);
+  if(db >= x->x_threshold_over)
+  {
+    x->x_overflow_counter++;
+    outlet_float(x->x_outlet_over, (t_float)x->x_overflow_counter);
+  }
+  outlet_float(x->x_outlet_meter, db);
+  x->x_cur_peak = 0.0f;
+  clock_delay(x->x_clock, x->x_metro_time);
+}
+
+static void *pvu_tilde_new(t_floatarg metro_time, t_floatarg release_time, t_floatarg threshold)
+{
+  t_pvu_tilde *x;
+  t_float t;
+  
+  x = (t_pvu_tilde *)pd_new(pvu_tilde_class);
+  if(metro_time <= 0.0f)
+    metro_time = 300.0f;
+  if(metro_time <= 5.0f)
+    metro_time = 5.0f;
+  if(release_time <= 0.0f)
+    release_time = 300.0f;
+  if(release_time <= 5.0f)
+    release_time = 5.0f;
+  if(threshold == 0.0f)
+    threshold = -0.01f;
+  x->x_threshold_over = threshold;
+  x->x_overflow_counter = 0;
+  x->x_metro_time = metro_time;
+  x->x_release_time = release_time;
+  x->x_c1 = exp(-metro_time/release_time);
+  x->x_cur_peak = 0.0f;
+  x->x_old_peak = 0.0f;
+  x->x_clock = clock_new(x, (t_method)pvu_tilde_tick);
+  x->x_outlet_meter = outlet_new(&x->x_obj, &s_float);/* left */
+  x->x_outlet_over = outlet_new(&x->x_obj, &s_float); /* right */
+  x->x_started = 1;
+  x->x_msi = 0;
+  return(x);
+}
+
+static void pvu_tilde_ff(t_pvu_tilde *x)
+{
+  clock_free(x->x_clock);
+}
+
+void pvu_tilde_setup(void )
+{
+  pvu_tilde_class = class_new(gensym("pvu~"), (t_newmethod)pvu_tilde_new,
+    (t_method)pvu_tilde_ff, sizeof(t_pvu_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(pvu_tilde_class, t_pvu_tilde, x_msi);
+  class_addmethod(pvu_tilde_class, (t_method)pvu_tilde_dsp, gensym("dsp"), 0);
+  class_addfloat(pvu_tilde_class, pvu_tilde_float);
+  class_addmethod(pvu_tilde_class, (t_method)pvu_tilde_reset, gensym("reset"), 0);
+  class_addmethod(pvu_tilde_class, (t_method)pvu_tilde_start, gensym("start"), 0);
+  class_addmethod(pvu_tilde_class, (t_method)pvu_tilde_stop, gensym("stop"), 0);
+  class_addmethod(pvu_tilde_class, (t_method)pvu_tilde_t_release, gensym("t_release"), A_FLOAT, 0);
+  class_addmethod(pvu_tilde_class, (t_method)pvu_tilde_t_metro, gensym("t_metro"), A_FLOAT, 0);
+  class_addmethod(pvu_tilde_class, (t_method)pvu_tilde_threshold, gensym("threshold"), A_FLOAT, 0);
+  class_sethelpsymbol(pvu_tilde_class, gensym("iemhelp/help-pvu~"));
+}
diff --git a/src/iemlib1/rvu~.c b/src/iemlib1/rvu~.c
new file mode 100644
index 0000000..95a874a
--- /dev/null
+++ b/src/iemlib1/rvu~.c
@@ -0,0 +1,178 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ---------------- rvu~ - simple peak&rms-vu-meter. ----------------- */
+
+typedef struct _rvu_tilde
+{
+  t_object  x_obj;
+  void      *x_clock_metro;
+  t_float   x_metro_time;
+  t_float   x_sum_rms;
+  t_float   x_old_rms;
+  t_float   x_rcp;
+  t_float   x_sr;
+  t_float   x_release_time;
+  t_float   x_c1;
+  int       x_started;
+  t_float   x_msi;
+} t_rvu_tilde;
+
+t_class *rvu_tilde_class;
+static void rvu_tilde_tick_metro(t_rvu_tilde *x);
+
+static void rvu_tilde_reset(t_rvu_tilde *x)
+{
+  outlet_float(x->x_obj.ob_outlet, -99.9f);
+  x->x_sum_rms = 0.0f;
+  x->x_old_rms = 0.0f;
+  clock_delay(x->x_clock_metro, x->x_metro_time);
+}
+
+static void rvu_tilde_stop(t_rvu_tilde *x)
+{
+  clock_unset(x->x_clock_metro);
+  x->x_started = 0;
+}
+
+static void rvu_tilde_start(t_rvu_tilde *x)
+{
+  clock_delay(x->x_clock_metro, x->x_metro_time);
+  x->x_started = 1;
+}
+
+static void rvu_tilde_float(t_rvu_tilde *x, t_floatarg f)
+{
+  if(f == 0.0f)
+  {
+    clock_unset(x->x_clock_metro);
+    x->x_started = 0;
+  }
+  else
+  {
+    clock_delay(x->x_clock_metro, x->x_metro_time);
+    x->x_started = 1;
+  }
+}
+
+static void rvu_tilde_t_release(t_rvu_tilde *x, t_floatarg release_time)
+{
+  if(release_time <= 5.0f)
+    release_time = 5.0f;
+  x->x_release_time = release_time;
+  x->x_c1 = exp(-2.0f*x->x_metro_time/x->x_release_time);
+}
+
+static void rvu_tilde_t_metro(t_rvu_tilde *x, t_floatarg metro_time)
+{
+  if(metro_time <= 5.0f)
+    metro_time = 5.0f;
+  x->x_metro_time = metro_time;
+  x->x_c1 = exp(-2.0f*x->x_metro_time/x->x_release_time);
+  x->x_rcp = 1.0f/(x->x_sr*x->x_metro_time);
+}
+
+static t_int *rvu_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_rvu_tilde *x = (t_rvu_tilde *)(w[2]);
+  int n = (int)(w[3]);
+  t_float pow, sum=x->x_sum_rms;
+  int i;
+  
+  if(x->x_started)
+  {
+    for(i=0; i<n; i++)
+    {
+      sum += in[i]*in[i];
+    }
+    x->x_sum_rms = sum;
+  }
+  return(w+4);
+}
+
+static void rvu_tilde_dsp(t_rvu_tilde *x, t_signal **sp)
+{
+  x->x_sr = 0.001*(t_float)sp[0]->s_sr;
+  x->x_rcp = 1.0f/(x->x_sr*x->x_metro_time);
+  dsp_add(rvu_tilde_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
+  clock_delay(x->x_clock_metro, x->x_metro_time);
+}
+
+static void rvu_tilde_tick_metro(t_rvu_tilde *x)
+{
+  t_float dbr, cur_rms, c1=x->x_c1;
+  
+  cur_rms = (1.0f - c1)*x->x_sum_rms*x->x_rcp + c1*x->x_old_rms;
+  /* NAN protect */
+  if(IEM_DENORMAL(cur_rms))
+    cur_rms = 0.0f;
+  
+  if(cur_rms <= 0.0000000001f)
+    dbr = -99.9f;
+  else if(cur_rms > 1000000.0f)
+  {
+    dbr = 60.0f;
+    x->x_old_rms = 1000000.0f;
+  }
+  else
+    dbr = 4.3429448195f*log(cur_rms);
+  x->x_sum_rms = 0.0f;
+  x->x_old_rms = cur_rms;
+  outlet_float(x->x_obj.ob_outlet, dbr);
+  clock_delay(x->x_clock_metro, x->x_metro_time);
+}
+
+static void rvu_tilde_ff(t_rvu_tilde *x)
+{
+  clock_free(x->x_clock_metro);
+}
+
+static void *rvu_tilde_new(t_floatarg metro_time, t_floatarg release_time)
+{
+  t_rvu_tilde *x=(t_rvu_tilde *)pd_new(rvu_tilde_class);
+  
+  if(metro_time <= 0.0f)
+    metro_time = 300.0f;
+  if(metro_time <= 5.0f)
+    metro_time = 5.0f;
+  if(release_time <= 0.0f)
+    release_time = 300.0f;
+  if(release_time <= 5.0f)
+    release_time = 5.0f;
+  x->x_metro_time = metro_time;
+  x->x_release_time = release_time;
+  x->x_c1 = exp(-2.0f*x->x_metro_time/x->x_release_time);
+  x->x_sum_rms = 0.0f;
+  x->x_old_rms = 0.0f;
+  x->x_sr = 44.1f;
+  x->x_rcp = 1.0f/(x->x_sr*x->x_metro_time);
+  x->x_clock_metro = clock_new(x, (t_method)rvu_tilde_tick_metro);
+  x->x_started = 1;
+  outlet_new(&x->x_obj, &s_float);
+  x->x_msi = 0.0f;
+  return(x);
+}
+
+void rvu_tilde_setup(void)
+{
+  rvu_tilde_class = class_new(gensym("rvu~"), (t_newmethod)rvu_tilde_new,
+    (t_method)rvu_tilde_ff, sizeof(t_rvu_tilde), 0,
+    A_DEFFLOAT, A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(rvu_tilde_class, t_rvu_tilde, x_msi);
+  class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_dsp, gensym("dsp"), 0);
+  class_addfloat(rvu_tilde_class, rvu_tilde_float);
+  class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_reset, gensym("reset"), 0);
+  class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_start, gensym("start"), 0);
+  class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_stop, gensym("stop"), 0);
+  class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_t_release, gensym("t_release"), A_FLOAT, 0);
+  class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_t_metro, gensym("t_metro"), A_FLOAT, 0);
+  class_sethelpsymbol(rvu_tilde_class, gensym("iemhelp/help-rvu~"));
+}
diff --git a/src/iemlib1/sin_phase~.c b/src/iemlib1/sin_phase~.c
new file mode 100644
index 0000000..baf34f4
--- /dev/null
+++ b/src/iemlib1/sin_phase~.c
@@ -0,0 +1,121 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+
+/* --- sin_phase~ - output the phase-difference between --- */
+/* --- 2 sinewaves with the same frequency in samples ----- */
+/* --- as a signal ---------------------------------------- */
+
+typedef struct _sin_phase_tilde
+{
+  t_object x_obj;
+  t_float  x_prev1;
+  t_float  x_prev2;
+  t_float  x_cur_out;
+  int      x_counter1;
+  int      x_counter2;
+  int      x_state1;
+  int      x_state2;
+  t_float  x_msi;
+} t_sin_phase_tilde;
+
+t_class *sin_phase_tilde_class;
+
+static t_int *sin_phase_tilde_perform(t_int *w)
+{
+  t_float *in1 = (t_float *)(w[1]);
+  t_float *in2 = (t_float *)(w[2]);
+  t_float *out = (t_float *)(w[3]);
+  t_sin_phase_tilde *x = (t_sin_phase_tilde *)(w[4]);
+  int i, n = (t_int)(w[5]);
+  t_float prev1=x->x_prev1;
+  t_float prev2=x->x_prev2;
+  t_float cur_out=x->x_cur_out;
+  int counter1=x->x_counter1;
+  int counter2=x->x_counter2;
+  int state1=x->x_state1;
+  int state2=x->x_state2;
+  
+  for(i=0; i<n; i++)
+  {
+    if((in1[i] >= 0.0f) && (prev1 < 0.0f))
+    {/* pos. zero cross of sig_in_1 */
+      state1 = 1;
+      counter1 = 0;
+    }
+    else if((in1[i] < 0.0f) && (prev1 >= 0.0f))
+    {/* neg. zero cross of sig_in_1 */
+      state2 = 1;
+      counter2 = 0;
+    }
+    
+    if((in2[i] >= 0.0f) && (prev2 < 0.0f))
+    {/* pos. zero cross of sig_in_2 */
+      state1 = 0;
+      cur_out = (t_float)(counter1);
+      counter1 = 0;
+    }
+    else if((in2[i] < 0.0f) && (prev2 >= 0.0f))
+    {/* neg. zero cross of sig_in_2 */
+      state2 = 0;
+      cur_out = (t_float)(counter2);
+      counter2 = 0;
+    }
+    
+    if(state1)
+      counter1++;
+    if(state2)
+      counter2++;
+    
+    prev1 = in1[i];
+    prev2 = in2[i];
+    out[i] = cur_out;
+  }
+  
+  x->x_prev1 = prev1;
+  x->x_prev2 = prev2;
+  x->x_cur_out = cur_out;
+  x->x_counter1 = counter1;
+  x->x_counter2 = counter2;
+  x->x_state1 = state1;
+  x->x_state2 = state2;
+  
+  return(w+6);
+}
+
+static void sin_phase_tilde_dsp(t_sin_phase_tilde *x, t_signal **sp)
+{
+  dsp_add(sin_phase_tilde_perform, 5, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, x, sp[0]->s_n);
+}
+
+static void *sin_phase_tilde_new(void)
+{
+  t_sin_phase_tilde *x = (t_sin_phase_tilde *)pd_new(sin_phase_tilde_class);
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  
+  x->x_prev1 = 0.0f;
+  x->x_prev2 = 0.0f;
+  x->x_cur_out = 0.0f;
+  x->x_counter1 = 0;
+  x->x_counter2 = 0;
+  x->x_state1 = 0;
+  x->x_state2 = 0;
+  x->x_msi = 0;
+  
+  return (x);
+}
+
+void sin_phase_tilde_setup(void)
+{
+  sin_phase_tilde_class = class_new(gensym("sin_phase~"), (t_newmethod)sin_phase_tilde_new,
+        0, sizeof(t_sin_phase_tilde), 0, 0);
+  CLASS_MAINSIGNALIN(sin_phase_tilde_class, t_sin_phase_tilde, x_msi);
+  class_addmethod(sin_phase_tilde_class, (t_method)sin_phase_tilde_dsp, gensym("dsp"), 0);
+  class_sethelpsymbol(sin_phase_tilde_class, gensym("iemhelp/help-sin_phase~"));
+}
diff --git a/src/iemlib1/soundfile_info.c b/src/iemlib1/soundfile_info.c
index 662216c..1eb4ded 100644
--- a/src/iemlib1/soundfile_info.c
+++ b/src/iemlib1/soundfile_info.c
@@ -3,11 +3,6 @@
 
 iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
 
-#ifdef _MSC_VER
-#pragma warning( disable : 4244 )
-#pragma warning( disable : 4305 )
-#endif
-
 #include "m_pd.h"
 #include "iemlib.h"
 #include <stdlib.h>
@@ -162,7 +157,7 @@ soundfile_info_fmt:
         post("soundfile_info_read-error:  %s has no common channel-number", completefilename);
         goto soundfile_info_end;
       }
-      SETFLOAT(x->x_atheader+SFI_HEADER_CHANNELS, (float)ss);
+      SETFLOAT(x->x_atheader+SFI_HEADER_CHANNELS, (t_float)ss);
       ch = ss;
       header_size += 2;
       cvec += 2;
@@ -173,7 +168,7 @@ soundfile_info_fmt:
         post("soundfile_info_read-error:  %s has no common samplerate", completefilename);
         goto soundfile_info_end;
       }
-      SETFLOAT(x->x_atheader+SFI_HEADER_SAMPLERATE, (float)ll);
+      SETFLOAT(x->x_atheader+SFI_HEADER_SAMPLERATE, (t_float)ll);
       sr = ll;
       header_size += 4;
       cvec += 4;
@@ -188,7 +183,7 @@ soundfile_info_fmt:
         post("soundfile_info_read-error:  %s has no common number of bytes per sample", completefilename);
         goto soundfile_info_end;
       }
-      SETFLOAT(x->x_atheader+SFI_HEADER_BYTES_PER_SAMPLE, (float)(ss/ch));
+      SETFLOAT(x->x_atheader+SFI_HEADER_BYTES_PER_SAMPLE, (t_float)(ss/ch));
       bps = ss;
       header_size += 2;
       cvec += 2;
@@ -210,11 +205,11 @@ soundfile_info_data:
       header_size += 8;
       cvec += 8;
       
-      SETFLOAT(x->x_atheader+SFI_HEADER_HEADERBYTES, (float)header_size);
+      SETFLOAT(x->x_atheader+SFI_HEADER_HEADERBYTES, (t_float)header_size);
       
       filesize -= header_size;
       filesize /= bps;
-      SETFLOAT(x->x_atheader+SFI_HEADER_MULTICHANNEL_FILE_LENGTH, (float)filesize);
+      SETFLOAT(x->x_atheader+SFI_HEADER_MULTICHANNEL_FILE_LENGTH, (t_float)filesize);
       SETSYMBOL(x->x_atheader+SFI_HEADER_ENDINESS, gensym("l"));
       SETSYMBOL(x->x_atheader+SFI_HEADER_FILENAME, gensym(completefilename));
       
diff --git a/src/iemlib1/split.c b/src/iemlib1/split.c
index b95f93c..cfe7de8 100644
--- a/src/iemlib1/split.c
+++ b/src/iemlib1/split.c
@@ -3,17 +3,10 @@
 
 iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
 
-#ifdef _MSC_VER
-#pragma warning( disable : 4244 )
-#pragma warning( disable : 4305 )
-#endif
-
 
 #include "m_pd.h"
 #include "iemlib.h"
-#include <math.h>
-#include <stdio.h>
-#include <string.h>
+
 
 /* --------- split is like moses ----------- */
 
diff --git a/src/iemlib1/v2db.c b/src/iemlib1/v2db.c
index e0781ea..d11682d 100644
--- a/src/iemlib1/v2db.c
+++ b/src/iemlib1/v2db.c
@@ -3,23 +3,17 @@
 
 iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
 
-#ifdef _MSC_VER
-#pragma warning( disable : 4244 )
-#pragma warning( disable : 4305 )
-#endif
-
 
 #include "m_pd.h"
 #include "iemlib.h"
 #include <math.h>
-#include <stdio.h>
-#include <string.h>
+
 
 /* -------- v2db - a rms-value to techn. dB  converter. --------- */
 
 static t_class *v2db_class;
 
-float v2db(float f)
+t_float v2db(t_float f)
 {
   return (f <= 0 ? -199.9 : 8.6858896381*log(f));
 }
diff --git a/src/iemlib1/vcf_filter~.c b/src/iemlib1/vcf_filter~.c
new file mode 100644
index 0000000..9aeb2a0
--- /dev/null
+++ b/src/iemlib1/vcf_filter~.c
@@ -0,0 +1,326 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ---------- vcf_filter~ - slow dynamic vcf_filter 1. and 2. order ----------- */
+
+typedef struct _vcf_filter_tilde
+{
+  t_object x_obj;
+  t_float  x_wn1;
+  t_float  x_wn2;
+  t_float  x_msi;
+  char     x_filtname[6];
+} t_vcf_filter_tilde;
+
+t_class *vcf_filter_tilde_class;
+
+static t_int *vcf_filter_tilde_perform_snafu(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[4]);
+  int n = (t_int)(w[6]);
+  
+  while(n--)
+    *out++ = *in++;
+  return(w+7);
+}
+
+/*
+lp2
+wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+*out++ = rcp*(wn0 + 2.0f*wn1 + wn2);
+wn2 = wn1;
+wn1 = wn0;
+
+  bp2
+  wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*al*(wn0 - wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+      rbp2
+      wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+      *out++ = rcp*l*(wn0 - wn2);
+      wn2 = wn1;
+      wn1 = wn0;
+      
+        hp2
+        wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+        *out++ = rcp*(wn0 - 2.0f*wn1 + wn2);
+        wn2 = wn1;
+        wn1 = wn0;
+        
+*/
+
+static t_int *vcf_filter_tilde_perform_lp2(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *lp = (t_float *)(w[2]);
+  t_float *q = (t_float *)(w[3]);
+  t_float *out = (t_float *)(w[4]);
+  t_vcf_filter_tilde *x = (t_vcf_filter_tilde *)(w[5]);
+  int i, n = (t_int)(w[6]);
+  t_float wn0, wn1=x->x_wn1, wn2=x->x_wn2;
+  t_float l, al, l2, rcp;
+  
+  for(i=0; i<n; i+=4)
+  {
+    l = lp[i];
+    if(q[i] < 0.000001f)
+      al = 1000000.0f*l;
+    else if(q[i] > 1000000.0f)
+      al = 0.000001f*l;
+    else
+      al = l/q[i];
+    l2 = l*l + 1.0f;
+    rcp = 1.0f/(al + l2);
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*(wn0 + 2.0f*wn1 + wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*(wn0 + 2.0f*wn1 + wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*(wn0 + 2.0f*wn1 + wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*(wn0 + 2.0f*wn1 + wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn2))
+    wn2 = 0.0f;
+  if(IEM_DENORMAL(wn1))
+    wn1 = 0.0f;
+  
+  x->x_wn1 = wn1;
+  x->x_wn2 = wn2;
+  return(w+7);
+}
+
+static t_int *vcf_filter_tilde_perform_bp2(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *lp = (t_float *)(w[2]);
+  t_float *q = (t_float *)(w[3]);
+  t_float *out = (t_float *)(w[4]);
+  t_vcf_filter_tilde *x = (t_vcf_filter_tilde *)(w[5]);
+  int i, n = (t_int)(w[6]);
+  t_float wn0, wn1=x->x_wn1, wn2=x->x_wn2;
+  t_float l, al, l2, rcp;
+  
+  for(i=0; i<n; i+=4)
+  {
+    l = lp[i];
+    if(q[i] < 0.000001f)
+      al = 1000000.0f*l;
+    else if(q[i] > 1000000.0f)
+      al = 0.000001f*l;
+    else
+      al = l/q[i];
+    l2 = l*l + 1.0f;
+    rcp = 1.0f/(al + l2);
+    
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*al*(wn0 - wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*al*(wn0 - wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*al*(wn0 - wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*al*(wn0 - wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn2))
+    wn2 = 0.0f;
+  if(IEM_DENORMAL(wn1))
+    wn1 = 0.0f;
+  
+  x->x_wn1 = wn1;
+  x->x_wn2 = wn2;
+  return(w+7);
+}
+
+static t_int *vcf_filter_tilde_perform_rbp2(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *lp = (t_float *)(w[2]);
+  t_float *q = (t_float *)(w[3]);
+  t_float *out = (t_float *)(w[4]);
+  t_vcf_filter_tilde *x = (t_vcf_filter_tilde *)(w[5]);
+  int i, n = (t_int)(w[6]);
+  t_float wn0, wn1=x->x_wn1, wn2=x->x_wn2;
+  t_float al, l, l2, rcp;
+  
+  for(i=0; i<n; i+=4)
+  {
+    l = lp[i];
+    if(q[i] < 0.000001f)
+      al = 1000000.0f*l;
+    else if(q[i] > 1000000.0f)
+      al = 0.000001f*l;
+    else
+      al = l/q[i];
+    l2 = l*l + 1.0f;
+    rcp = 1.0f/(al + l2);
+    
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*l*(wn0 - wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*l*(wn0 - wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*l*(wn0 - wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = rcp*l*(wn0 - wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn2))
+    wn2 = 0.0f;
+  if(IEM_DENORMAL(wn1))
+    wn1 = 0.0f;
+  
+  x->x_wn1 = wn1;
+  x->x_wn2 = wn2;
+  return(w+7);
+}
+
+static t_int *vcf_filter_tilde_perform_hp2(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *lp = (t_float *)(w[2]);
+  t_float *q = (t_float *)(w[3]);
+  t_float *out = (t_float *)(w[4]);
+  t_vcf_filter_tilde *x = (t_vcf_filter_tilde *)(w[5]);
+  int i, n = (t_int)(w[6]);
+  t_float wn0, wn1=x->x_wn1, wn2=x->x_wn2;
+  t_float l, al, l2, rcp, forw;
+  
+  for(i=0; i<n; i+=4)
+  {
+    l = lp[i];
+    if(q[i] < 0.000001f)
+      al = 1000000.0f*l;
+    else if(q[i] > 1000000.0f)
+      al = 0.000001f*l;
+    else
+      al = l/q[i];
+    l2 = l*l + 1.0f;
+    rcp = 1.0f/(al + l2);
+    forw = rcp * (l2 - 1.0f);
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = forw*(wn0 - 2.0f*wn1 + wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = forw*(wn0 - 2.0f*wn1 + wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = forw*(wn0 - 2.0f*wn1 + wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+    
+    wn0 = *in++ - rcp*(2.0f*(2.0f - l2)*wn1 + (l2 - al)*wn2);
+    *out++ = forw*(wn0 - 2.0f*wn1 + wn2);
+    wn2 = wn1;
+    wn1 = wn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(wn2))
+    wn2 = 0.0f;
+  if(IEM_DENORMAL(wn1))
+    wn1 = 0.0f;
+  
+  x->x_wn1 = wn1;
+  x->x_wn2 = wn2;
+  return(w+7);
+}
+
+static void vcf_filter_tilde_dsp(t_vcf_filter_tilde *x, t_signal **sp)
+{
+  if(!strcmp(x->x_filtname,"bp2"))
+    dsp_add(vcf_filter_tilde_perform_bp2, 6, sp[0]->s_vec, sp[1]->s_vec, 
+    sp[2]->s_vec, sp[3]->s_vec, x, sp[0]->s_n);
+  else if(!strcmp(x->x_filtname,"rbp2"))
+    dsp_add(vcf_filter_tilde_perform_rbp2, 6, sp[0]->s_vec, sp[1]->s_vec, 
+    sp[2]->s_vec, sp[3]->s_vec, x, sp[0]->s_n);
+  else if(!strcmp(x->x_filtname,"lp2"))
+    dsp_add(vcf_filter_tilde_perform_lp2, 6, sp[0]->s_vec, sp[1]->s_vec,
+    sp[2]->s_vec, sp[3]->s_vec, x, sp[0]->s_n);
+  else if(!strcmp(x->x_filtname,"hp2"))
+    dsp_add(vcf_filter_tilde_perform_hp2, 6, sp[0]->s_vec, sp[1]->s_vec,
+    sp[2]->s_vec, sp[3]->s_vec, x, sp[0]->s_n);
+  else
+  {
+    dsp_add(vcf_filter_tilde_perform_snafu, 6, sp[0]->s_vec, sp[1]->s_vec,
+      sp[2]->s_vec, sp[3]->s_vec, x, sp[0]->s_n);
+    post("vcf_filter~-Error: 1. initial-arguments: <sym> kind: lp2, bp2, rbp2, hp2!");
+  }
+}
+
+static void *vcf_filter_tilde_new(t_symbol *filt_typ)
+{
+  t_vcf_filter_tilde *x = (t_vcf_filter_tilde *)pd_new(vcf_filter_tilde_class);
+  char *c;
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_msi = 0;
+  x->x_wn1 = 0.0f;
+  x->x_wn2 = 0.0f;
+  c = (char *)filt_typ->s_name;
+  c[5] = 0;
+  strcpy(x->x_filtname, c);
+  return(x);
+}
+
+void vcf_filter_tilde_setup(void)
+{
+  vcf_filter_tilde_class = class_new(gensym("vcf_filter~"), (t_newmethod)vcf_filter_tilde_new,
+    0, sizeof(t_vcf_filter_tilde), 0, A_DEFSYM, 0);
+  CLASS_MAINSIGNALIN(vcf_filter_tilde_class, t_vcf_filter_tilde, x_msi);
+  class_addmethod(vcf_filter_tilde_class, (t_method)vcf_filter_tilde_dsp, gensym("dsp"), 0);
+  class_sethelpsymbol(vcf_filter_tilde_class, gensym("iemhelp/help-vcf_filter~"));
+}