10 files changed, 2058 insertions, 0 deletions
diff --git a/adaptive/src/adaptive.c b/adaptive/src/adaptive.c
new file mode 100755
index 0000000..223bb0a
--- /dev/null
+++ b/adaptive/src/adaptive.c
@@ -0,0 +1,158 @@
+/******************************************************
+ *
+ * Adaptive Systems for PD
+ *
+ * copyleft (c) Gerda Strobl, Georg Holzmann
+ * 2005
+ *
+ * for complaints, suggestions: grh@mur.at
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+#include "adaptive.h"
+
+typedef struct _adaptive 
+{
+  t_object x_obj;
+} t_adaptive;
+
+t_class *adaptive_class;
+
+static void adaptive_help(void)
+{
+  post("\n-----------------------------------------------");
+  post("adaptive systems for PD");
+  post("copyleft (c) Gerda Strobl, Georg Holzmann, 2005");
+  post("");
+  post("for more info look at the help patches!");
+  post("-----------------------------------------------\n");
+}
+
+void *adaptive_new(void)
+{
+  t_adaptive *x = (t_adaptive *)pd_new(adaptive_class);
+  return (void *)x;
+}
+
+//-----------------------------------------------------
+// declaration of the setup functions:
+void lms_tilde_setup();
+void lms2_tilde_setup();
+void nlms_tilde_setup();
+void nlms2_tilde_setup();
+void nlms3_tilde_setup();
+//-end-of-declaration----------------------------------
+
+void adaptive_setup(void) 
+{
+  //---------------------------------------------------
+  // call all the setup functions:
+  lms_tilde_setup();
+  lms2_tilde_setup();
+  nlms_tilde_setup();
+  nlms2_tilde_setup();
+  nlms3_tilde_setup();
+  //-end-----------------------------------------------
+
+  post("\nadaptive: 2005 by Gerda Strobl and Georg Holzmann");
+ 
+  adaptive_class = class_new(gensym("adaptive"), adaptive_new, 0, sizeof(t_adaptive), 0, 0);
+  class_addmethod(adaptive_class, (t_method)adaptive_help, gensym("help"), 0);
+}
+
+
+/* ---------------------- helpers ----------------------- */
+
+void adaptation_write(const char *filename, t_int N, t_float mu, t_float *c)
+{
+  FILE *f=0;
+  int i;
+
+  // open file
+  f = fopen(filename, "w");
+  if(!f)
+  {
+    post("adaptive, save: error open file");
+    return;
+  }
+
+  // write little header, number of coefficients and mu
+  fprintf(f, "adaptivePD\n");
+  fprintf(f, "size: %d\n", N);
+  fprintf(f, "mu: %.30f\n", mu);
+  
+  // write coefficients
+  for(i=0; i<N; i++)
+    fprintf(f, "%.30f\n", c[i]);
+
+  // close file
+  if (f) fclose(f);
+  post("adaptive, save: coefficients written to file");
+}
+
+void adaptation_read(const char *filename, t_int *N, t_float *mu, 
+                     t_float *c, t_float *buf)
+{
+  FILE *f=0;
+  int i, n=0;
+
+  // open file
+  f = fopen(filename, "r");
+  if(!f)
+  {
+    post("adaptive, open: error open file");
+    return;
+  }
+  
+  // read header and nr of coefficients
+  if ( fscanf(f,"adaptivePD\n") != 0) 
+  {
+    post("adaptive, open: error in reading file");
+    return;
+  }
+  if ( fscanf(f,"size: %d\n",&n) != 1)
+  {
+    post("adaptive, open: error in reading file");
+    return;
+  };
+  
+  // change size of the filter if needed
+  if(n != *N)
+  {
+    if(c) freebytes(c, sizeof(t_float) * (*N));
+    if(buf) freebytes(buf, sizeof(t_sample) * (*N-1));
+    
+    *N = (n<=0) ? 1 : n;
+   
+    post("WARNING (adaptive): Nr. of coefficients is changed to %d!",*N);
+     
+    // allocate mem and init coefficients
+    c = (t_float *)getbytes(sizeof(t_float) * (*N));
+    
+    // allocate mem for temp buffer
+    buf = (t_sample *)getbytes(sizeof(t_sample) * (*N-1));
+    for(i=0; i<(*N-1); i++)
+      buf[i] = 0;
+  }
+  
+  // read mu
+  if ( fscanf(f,"mu: %f\n",mu) != 1)
+  {
+    post("adaptive, open: error in reading file");
+    return;
+  };
+
+  // get coefficients:
+  for(i=0; i<(*N); i++)
+    if( fscanf(f, "%f\n", c+i) != 1)
+    {
+      post("adaptive, open: error in reading file");
+      return;
+    }
+    //post("c_inside: %d",c);
+  post("adaptive, read: coefficients readed from file");  
+}
diff --git a/adaptive/src/adaptive.h b/adaptive/src/adaptive.h
new file mode 100755
index 0000000..209a51a
--- /dev/null
+++ b/adaptive/src/adaptive.h
@@ -0,0 +1,34 @@
+/******************************************************
+ *
+ * Adaptive Systems for PD
+ *
+ * copyleft (c) Gerda Strobl, Georg Holzmann
+ * 2005
+ *
+ * for complaints, suggestions: grh@mur.at
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+#ifndef __ADAPTIVE_H__
+#define __ADAPTIVE_H__
+
+#include "m_pd.h"
+#include <stdio.h>
+
+
+
+/* ---------------------- helpers ----------------------- */
+
+// save all data to file
+void adaptation_write(const char *filename, t_int N, t_float mu, t_float *c);
+
+// read data from file
+void adaptation_read(const char *filename, t_int *N, t_float *mu, 
+                     t_float *c, t_float *buf);
+
+
+#endif  //__ADAPTIVE_H__
diff --git a/adaptive/src/lms2~.c b/adaptive/src/lms2~.c
new file mode 100755
index 0000000..c3c3d3c
--- /dev/null
+++ b/adaptive/src/lms2~.c
@@ -0,0 +1,332 @@
+/******************************************************
+ *
+ * Adaptive Systems for PD
+ *
+ * copyleft (c) Gerda Strobl, Georg Holzmann
+ * 2005
+ *
+ * for complaints, suggestions: grh@mur.at
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+#include "adaptive.h"
+
+
+/* ------------------------ lms2~ ------------------------- */
+
+static t_class *lms2_tilde_class;
+
+typedef struct _lms2
+{
+  t_object x_obj;
+  t_float f;
+  t_atom *coef;
+  t_sample *buf;
+  t_sample *y_tmp;
+  t_sample *e_tmp;
+  t_int bufsize;
+  t_outlet *c_out;
+  int adapt; // enable/disable adaptation
+  
+  t_int N; //number of coefficients of the adaptive system
+  t_float *c; // coefficients of the system
+  t_float mu; // step-size parameter (learning rate)
+
+  t_canvas *x_canvas;
+} t_lms2_tilde;
+
+static void lms2_tilde_a(t_lms2_tilde *x, t_floatarg f)
+{
+  x->adapt = (f==0) ? 0 : 1;
+}
+
+static void lms2_tilde_geta(t_lms2_tilde *x)
+{
+  if(x->adapt==0)
+    post("lms2~: adaptation is currently OFF");
+  else
+    post("lms2~: adaptation is currently ON");
+}
+
+static void lms2_tilde_mu(t_lms2_tilde *x, t_floatarg f)
+{
+  x->mu = f;
+}
+
+static void lms2_tilde_getmu(t_lms2_tilde *x)
+{
+  post("mu (step-size parameter): %f", x->mu);
+}
+
+static void lms2_tilde_getN(t_lms2_tilde *x)
+{
+  post("N (number of coefficients): %d", x->N);
+}
+
+static void lms2_tilde_clear(t_lms2_tilde *x)
+{
+  int i;
+  
+  // clear coefficients
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void lms2_tilde_init(t_lms2_tilde *x)
+{
+  int i;
+  
+  // set the first coefficient to 1, all others to 0
+  // so this is a delay free transmission
+  x->c[0] = 1;
+  for(i=1; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffers
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void lms2_tilde_print(t_lms2_tilde *x)
+{
+  int i;
+  
+  // print coefficients
+  post("\nNr. of coefficients: %d",x->N);
+  post("coefficients:");
+  for(i=0; i<x->N; i++)
+    post("\t%d: %f",i,x->c[i]);
+}
+
+static void lms2_tilde_write(t_lms2_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+
+  // save to file
+  adaptation_write(filename, x->N, x->mu, x->c);
+}
+
+static void lms2_tilde_read(t_lms2_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  int n = x->N;
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+  
+  // read file
+  adaptation_read(filename, &x->N, &x->mu, x->c, x->buf);
+  
+  // if length changes:
+  if(x->N != n)
+  {
+    if(x->coef) freebytes(x->coef, sizeof(t_atom) * x->N);
+    x->coef = (t_atom *)getbytes(sizeof(t_atom) * x->N);
+  }
+}
+
+static t_int *lms2_tilde_perform(t_int *w)
+{
+  t_sample *x_ = (t_sample *)(w[1]);
+  t_sample *d_ = (t_sample *)(w[2]);
+  t_sample *y_ = (t_sample *)(w[3]);
+  t_sample *e_ = (t_sample *)(w[4]);
+  int n = (int)(w[5]);
+  t_lms2_tilde *x = (t_lms2_tilde *)(w[6]);
+  int i, j, tmp;
+
+  
+  for(i=0; i<n; i++)
+  {
+    // calc output (filter)
+        
+    x->y_tmp[i]=0;
+    
+    // y_[i] += x->c[j] * x_[i-j];
+    // so lets split in two halfs, so that
+    // negative indezes get samples from the
+    // last audioblock (x->buf) ...
+    
+    tmp = (i+1 - x->N)*(-1);
+    tmp = tmp<0 ? 0 : tmp;
+    
+    for(j=0; j<x->N-tmp; j++)
+      x->y_tmp[i] += x->c[j] * x_[i-j];
+    
+    for(j=x->N-tmp; j<x->N; j++)
+      x->y_tmp[i] += x->c[j] * x->buf[(i-j)*(-1)-1];
+
+    if(x->adapt)
+    {
+      // error computation
+      x->e_tmp[i] = d_[i] - x->y_tmp[i];
+        
+      // coefficient adaptation
+      // (split in the same way as above)
+    
+      for(j=0; j<x->N-tmp; j++)
+        x->c[j] = x->c[j] + x->mu * x_[i-j] * x->e_tmp[i];
+    
+      for(j=x->N-tmp; j<x->N; j++)
+        x->c[j] = x->c[j] + x->mu * x->buf[(i-j)*(-1)-1] * x->e_tmp[i];
+    }
+    else x->e_tmp[i] = 0;
+        
+    //post("%d: in %f, d: %f, out: %f, e: %f, c1:%f, c2:%f", i, x_[i], d_[i], x->y_tmp[i], x->e_tmp[i], x->c[0], x->c[1]);
+  }
+  
+  // outlet coefficients
+  for(i=0; i<x->N; i++)
+    SETFLOAT(&x->coef[i],x->c[i]);
+  
+  outlet_list(x->c_out, &s_list, x->N, x->coef);
+  
+  // store last samples for next audiobuffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = x_[n-1-i];
+  
+  // now write tmps to outlets
+  while(n--)
+  {
+    y_[n] = x->y_tmp[n];
+    e_[n] = x->e_tmp[n];
+  }
+   
+  return (w+7);
+}
+
+static void lms2_tilde_dsp(t_lms2_tilde *x, t_signal **sp)
+{
+  // allocate new temp buffer if buffersize changes
+  if(x->bufsize != sp[0]->s_n)
+  {
+    if(sp[0]->s_n < x->N)
+      post("lms2~ WARNING: buffersize must be bigger than N, you will get wrong results !!!");
+    
+    if(x->y_tmp) freebytes(x->y_tmp, sizeof(t_sample) * x->bufsize);
+    x->y_tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    if(x->e_tmp) freebytes(x->e_tmp, sizeof(t_sample) * x->bufsize);
+    x->e_tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    x->bufsize =  sp[0]->s_n;
+  }
+  
+  dsp_add(lms2_tilde_perform, 6, sp[0]->s_vec, sp[1]->s_vec, 
+          sp[2]->s_vec, sp[3]->s_vec, sp[0]->s_n, x);
+}
+
+static void lms2_tilde_helper(void)
+{
+  post("\nlms2~: Adaptive transversal filter using LMS (for algorithm analysis)");
+  post("INPUT:");
+  post("\tinlet1: input signal x[n]");
+  post("\tinlet2: desired output signal d[n]");
+  post("\tinit_arg1: number of coefficients of the adaptive system");
+  post("\tinit_arg2, mu: step-size parameter (learning rate)");
+  post("OUTPUT:");
+  post("\toutlet1: output signal y[n]");
+  post("\toutlet2: error signal e[n]");
+  post("\toutlet3: coefficients c[n] (only per block)\n");
+}
+
+static void *lms2_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_lms2_tilde *x = (t_lms2_tilde *)pd_new(lms2_tilde_class);
+  int i;
+  
+  // default values:
+  x->N = 8;
+  x->mu = 0.05;
+  x->adapt = 0;
+  x->y_tmp = NULL;
+  x->e_tmp = NULL;
+  x->bufsize = 0;
+  
+  switch(argc)
+  {
+    case 2:
+      x->mu = atom_getfloat(argv+1);
+    case 1:
+      x->N = atom_getint(argv);
+      x->N = (x->N<=0) ? 1 : x->N;
+  }
+  
+  // allocate mem and init coefficients
+  x->c = (t_float *)getbytes(sizeof(t_float) * x->N);
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // allocate mem for temp buffer
+  x->buf = (t_float *)getbytes(sizeof(t_float) * x->N-1);
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+  
+  // for output atoms (coefficients):
+  x->coef = (t_atom *)getbytes(sizeof(t_atom) * x->N);
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  x->c_out = outlet_new(&x->x_obj, 0);
+  
+  x->x_canvas = canvas_getcurrent();
+
+
+  return (x);
+}
+
+static void lms2_tilde_free(t_lms2_tilde *x)
+{
+  if(x->c) freebytes(x->c, sizeof(t_float) * x->N);
+  if(x->buf) freebytes(x->buf, sizeof(t_sample) * x->N-1);
+  if(x->y_tmp) freebytes(x->y_tmp, sizeof(t_sample) * x->bufsize);
+  if(x->e_tmp) freebytes(x->e_tmp, sizeof(t_sample) * x->bufsize);
+  if(x->coef) freebytes(x->coef, sizeof(t_atom) * x->N);
+}
+
+void lms2_tilde_setup(void)
+{
+  lms2_tilde_class = class_new(gensym("lms2~"), (t_newmethod)lms2_tilde_new, 
+                    (t_method)lms2_tilde_free, sizeof(t_lms2_tilde), 
+                    CLASS_DEFAULT, A_GIMME, 0);
+
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_a,
+                  gensym("adaptation"), A_DEFFLOAT, 0);
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_geta,
+                  gensym("getadaptation"), 0);
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_mu, 
+                  gensym("mu"), A_DEFFLOAT, 0);
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_getmu,
+                  gensym("getmu"), 0);
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_getN,
+                  gensym("getN"), 0);
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_init,
+                  gensym("init_unity"), 0);
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_clear,
+                  gensym("clear"), 0);
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_print,
+                  gensym("print"), 0);
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_write, 
+                  gensym("write"), A_DEFSYMBOL, 0);
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_read, 
+                  gensym("read"), A_DEFSYMBOL, 0);
+
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(lms2_tilde_class, t_lms2_tilde, f);
+  
+  class_addmethod(lms2_tilde_class, (t_method)lms2_tilde_helper, gensym("help"), 0);
+}
diff --git a/adaptive/src/lms~.c b/adaptive/src/lms~.c
new file mode 100755
index 0000000..d39ccb7
--- /dev/null
+++ b/adaptive/src/lms~.c
@@ -0,0 +1,295 @@
+/******************************************************
+ *
+ * Adaptive Systems for PD
+ *
+ * copyleft (c) Gerda Strobl, Georg Holzmann
+ * 2005
+ *
+ * for complaints, suggestions: grh@mur.at
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+#include "adaptive.h"
+
+
+/* ------------------------ lms~ ------------------------- */
+
+static t_class *lms_tilde_class;
+
+typedef struct _lms
+{
+  t_object x_obj;
+  t_float f;
+  t_sample *buf;
+  t_sample *tmp;
+  t_int bufsize;
+  int adapt; // enable/disable adaptation
+  
+  t_int N; //number of coefficients of the adaptive system
+  t_float *c; // coefficients of the system
+  t_float mu; // step-size parameter (learning rate)
+
+  t_canvas *x_canvas;
+} t_lms_tilde;
+
+static void lms_tilde_a(t_lms_tilde *x, t_floatarg f)
+{
+  x->adapt = (f==0) ? 0 : 1;
+}
+
+static void lms_tilde_geta(t_lms_tilde *x)
+{
+  if(x->adapt==0)
+    post("lms~: adaptation is currently OFF");
+  else
+    post("lms~: adaptation is currently ON");
+}
+
+static void lms_tilde_mu(t_lms_tilde *x, t_floatarg f)
+{
+  x->mu = f;
+}
+
+static void lms_tilde_getmu(t_lms_tilde *x)
+{
+  post("mu (step-size parameter): %f", x->mu);
+}
+
+static void lms_tilde_getN(t_lms_tilde *x)
+{
+  post("N (number of coefficients): %d", x->N);
+}
+
+static void lms_tilde_clear(t_lms_tilde *x)
+{
+  int i;
+  
+  // clear coefficients
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void lms_tilde_init(t_lms_tilde *x)
+{
+  int i;
+  
+  // set the first coefficient to 1, all others to 0
+  // so this is a delay free transmission
+  x->c[0] = 1;
+  for(i=1; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffers
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void lms_tilde_print(t_lms_tilde *x)
+{
+  int i;
+  
+  // print coefficients
+  post("\nNr. of coefficients: %d",x->N);
+  post("coefficients:");
+  for(i=0; i<x->N; i++)
+    post("\t%d: %f",i,x->c[i]);
+}
+
+static void lms_tilde_write(t_lms_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+
+  // save to file
+  adaptation_write(filename, x->N, x->mu, x->c);
+}
+
+static void lms_tilde_read(t_lms_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+  
+  // read file
+  adaptation_read(filename, &x->N, &x->mu, x->c, x->buf);
+}
+
+static t_int *lms_tilde_perform(t_int *w)
+{
+  t_lms_tilde *x = (t_lms_tilde *)(w[1]);
+  t_sample *x_ = (t_sample *)(w[2]);
+  t_sample *d_ = (t_sample *)(w[3]);
+  t_sample *y_ = (t_sample *)(w[4]);
+  int n = (int)(w[5]);
+  int i, j, tmp;
+  t_sample e=0;
+  
+  
+  for(i=0; i<n; i++)
+  {
+    // calc output (filter)
+    
+    x->tmp[i]=0;
+    
+    // y_[i] += x->c[j] * x_[i-j];
+    // so lets split in two halfs, so that
+    // negative indezes get samples from the
+    // last audioblock (x->buf) ...
+    tmp = (i+1 - x->N)*(-1);
+    tmp = tmp<0 ? 0 : tmp;
+    
+    for(j=0; j<x->N-tmp; j++)
+      x->tmp[i] += x->c[j] * x_[i-j];
+    
+    for(j=x->N-tmp; j<x->N; j++)
+      x->tmp[i] += x->c[j] * x->buf[(i-j)*(-1)-1];
+    
+    if(x->adapt)
+    {
+      // error computation
+      e = d_[i] - x->tmp[i];
+        
+      // coefficient adaptation
+      // (split in the same way as above)
+    
+      for(j=0; j<x->N-tmp; j++)
+        x->c[j] = x->c[j] + x->mu * x_[i-j] * e;
+    
+      for(j=x->N-tmp; j<x->N; j++)
+        x->c[j] = x->c[j] + x->mu * x->buf[(i-j)*(-1)-1] * e;
+    }
+    
+    //post("%d: in %f, d: %f, out: %f, error: %f, c1:%f, c2:%f", i, x_[i], d_[i], x->tmp[i], e, x->c[0], x->c[1]);
+  }
+
+  // store last samples for next audiobuffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = x_[n-1-i];
+  
+  // now write tmp to outlet
+  while(n--)
+    y_[n] = x->tmp[n];
+   
+  return (w+6);
+}
+
+static void lms_tilde_dsp(t_lms_tilde *x, t_signal **sp)
+{
+  // allocate new temp buffer if buffersize changes
+  if(x->bufsize != sp[0]->s_n)
+  {
+    if(sp[0]->s_n < x->N)
+      post("lms~ WARNING: buffersize must be bigger than N, you will get wrong results !!!");
+    
+    if(x->tmp) freebytes(x->tmp, sizeof(t_sample) * x->bufsize);
+    x->tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    x->bufsize =  sp[0]->s_n;
+  }
+
+  dsp_add(lms_tilde_perform, 5, x, sp[0]->s_vec, sp[1]->s_vec, 
+	  sp[2]->s_vec, sp[0]->s_n);
+}
+
+static void lms_tilde_helper(void)
+{
+  post("\nlms~: Adaptive transversal filter using LMS");
+  post("INPUT:");
+  post("\tinlet1: input signal x[n]");
+  post("\tinlet2: desired output signal d[n]");
+  post("\tinit_arg1: number of coefficients of the adaptive system");
+  post("\tinit_arg2, mu: step-size parameter (learning rate)");
+  post("OUTPUT:");
+  post("\toutlet1: output signal\n");
+}
+
+static void *lms_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_lms_tilde *x = (t_lms_tilde *)pd_new(lms_tilde_class);
+  int i;
+  
+  // default values:
+  x->N = 8;
+  x->mu = 0.05;
+  x->adapt = 0;
+  x->tmp = NULL;
+  x->bufsize = 0;
+  
+  switch(argc)
+  {
+    case 2:
+      x->mu = atom_getfloat(argv+1);
+    case 1:
+      x->N = atom_getint(argv);
+      x->N = (x->N<=0) ? 1 : x->N;
+  }
+  
+  // allocate mem and init coefficients
+  x->c = (t_float *)getbytes(sizeof(t_float) * x->N);
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // allocate mem for temp buffer
+  x->buf = (t_sample *)getbytes(sizeof(t_sample) * x->N-1);
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_canvas = canvas_getcurrent();
+
+  return (x);
+}
+
+static void lms_tilde_free(t_lms_tilde *x)
+{
+  if(x->c) freebytes(x->c, sizeof(t_float) * x->N);
+  if(x->buf) freebytes(x->buf, sizeof(t_sample) * x->N-1);
+  if(x->tmp) freebytes(x->tmp, sizeof(t_sample) * x->bufsize);
+}
+
+void lms_tilde_setup(void)
+{
+  lms_tilde_class = class_new(gensym("lms~"), (t_newmethod)lms_tilde_new, 
+                    (t_method)lms_tilde_free, sizeof(t_lms_tilde), 
+                    CLASS_DEFAULT, A_GIMME, 0);
+
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_a,
+                  gensym("adaptation"), A_DEFFLOAT, 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_geta,
+                  gensym("getadaptation"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_mu, 
+                  gensym("mu"), A_DEFFLOAT, 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_getmu,
+                  gensym("getmu"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_getN,
+                  gensym("getN"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_init,
+                  gensym("init_unity"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_clear,
+                  gensym("clear"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_print,
+                  gensym("print"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_write, 
+                  gensym("write"), A_DEFSYMBOL, 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_read, 
+                  gensym("read"), A_DEFSYMBOL, 0);
+
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(lms_tilde_class, t_lms_tilde, f);
+  
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_helper, gensym("help"), 0);
+}
diff --git a/adaptive/src/makefile b/adaptive/src/makefile
new file mode 100755
index 0000000..9a3f09b
--- /dev/null
+++ b/adaptive/src/makefile
@@ -0,0 +1,48 @@
+current: all
+
+.SUFFIXES: .pd_linux
+
+# make sure that the "m_pd.h" is somehow available either by putting it into this
+# directory, by adding it's path to the INCLUDE-path or by putting it into an
+# already included path, e.g. "/usr/include/"
+INCLUDE = -I. -I/usr/include/
+
+PDPATH = /usr/lib/pd
+
+LDFLAGS = -export-dynamic -shared
+
+#select either the DBG and OPT compiler flags below:
+
+CFLAGS = -DPD -DUNIX -W -Wno-unused \
+	-Wno-parentheses -Wno-switch -O6 -funroll-loops -fomit-frame-pointer
+
+SYSTEM = $(shell uname -m)
+
+# the sources:
+
+SRC = adaptive.c lms~.c lms2~.c nlms~.c nlms2~.c nlms3~.c
+
+TARGET = adaptive.pd_linux
+
+
+OBJ = $(SRC:.c=.o)
+
+
+#  ------------------ targets ------------------------------------
+
+
+clean:
+	rm -f *.o *.pd_linux
+
+all: $(OBJ)
+	@echo :: $(OBJ)
+	ld $(LDFLAGS) -o $(TARGET) $(OBJ)
+	strip --strip-unneeded $(TARGET)
+
+$(OBJ) : %.o : %.c
+	touch $*.c
+	cc $(CFLAGS) $(INCLUDE) -c -o $*.o $*.c
+
+install:
+	cp $(TARGET) $(PDPATH)/externs
+	cp ../doc/help-*.pd $(PDPATH)/doc/5.reference
diff --git a/adaptive/src/makefile_mingw b/adaptive/src/makefile_mingw
new file mode 100755
index 0000000..4f9d617
--- /dev/null
+++ b/adaptive/src/makefile_mingw
@@ -0,0 +1,46 @@
+current: all
+
+.SUFFIXES: .dll
+
+PDPATH = "c:/pd"
+
+INCLUDE = -I. -I$(PDPATH)/src
+
+LDFLAGS = --export-dynamic -shared
+
+#select either the DBG and OPT compiler flags below:
+
+CFLAGS = -DPD -DNT -W -Wno-unused -mms-bitfields\
+	-Wno-parentheses -Wno-switch -O6 -funroll-loops -fomit-frame-pointer
+
+SYSTEM = $(shell uname -m)
+
+# the sources:
+
+SRC = adaptive.c lms~.c lms2~.c nlms~.c nlms2~.c nlms3~.c
+
+TARGET = adaptive.dll
+
+
+OBJ = $(SRC:.c=.o)
+
+
+#  ------------------ targets ------------------------------------
+
+
+clean:
+	rm -f *.a *.def *.o *.dll
+
+all: $(OBJ)
+	@echo :: $(OBJ)
+	g++ $(LDFLAGS) -o $(TARGET) $(OBJ) $(PDPATH)/bin/pd.dll -libc
+	strip --strip-unneeded $(TARGET)
+	chmod 755 $(TARGET)
+
+$(OBJ) : %.o : %.c
+	touch $*.c
+	gcc $(CFLAGS) $(INCLUDE) -c -o $*.o $*.c
+
+install:
+	cp $(TARGET) $(PDPATH)/externs
+	cp ../doc/help-*.pd $(PDPATH)/doc/5.reference
diff --git a/adaptive/src/makefile_msvc b/adaptive/src/makefile_msvc
new file mode 100755
index 0000000..dc104c3
--- /dev/null
+++ b/adaptive/src/makefile_msvc
@@ -0,0 +1,39 @@
+
+current: all
+
+TARGET = adaptive.dll
+
+VIS_CPP_PATH = "C:\Programme\Microsoft Visual Studio\Vc98"
+
+PD_INST_PATH = "C:\pd"
+
+SRC = adaptive.c lms~.c lms2~.c nlms~.c nlms2~.c nlms3~.c
+
+PD_WIN_INCLUDE_PATH = /I. /I$(PD_INST_PATH)\src /I$(VIS_CPP_PATH)\include
+
+PD_WIN_C_FLAGS = /W3 /WX /DNT /DPD /nologo
+
+PD_WIN_L_FLAGS = /nologo
+
+PD_WIN_LIB = $(VIS_CPP_PATH)\lib\libc.lib \
+	$(VIS_CPP_PATH)\lib\oldnames.lib \
+	$(VIS_CPP_PATH)\lib\kernel32.lib \
+	$(PD_INST_PATH)\bin\pd.lib
+
+
+OBJ = $(SRC:.c=.obj)
+
+.c.obj:
+	cl $(PD_WIN_C_FLAGS) $(PD_WIN_INCLUDE_PATH) /c $*.c
+
+all: $(OBJ)
+	link $(PD_WIN_L_FLAGS) /dll /export:adaptive_setup \
+	/out:$(TARGET) $(OBJ) $(PD_WIN_LIB)
+	del *.obj *.lib *.exp
+
+clean:
+	del *.obj *.dll *.lib *.exp
+
+install:
+	copy *.dll $(PD_INST_PATH)\externs
+	copy ..\doc\*.pd $(PD_INST_PATH)\doc\5.reference
diff --git a/adaptive/src/nlms2~.c b/adaptive/src/nlms2~.c
new file mode 100755
index 0000000..c967641
--- /dev/null
+++ b/adaptive/src/nlms2~.c
@@ -0,0 +1,359 @@
+/******************************************************
+ *
+ * Adaptive Systems for PD
+ *
+ * copyleft (c) Gerda Strobl, Georg Holzmann
+ * 2005
+ *
+ * for complaints, suggestions: grh@mur.at
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+#include "adaptive.h"
+
+
+/* ------------------------ nlms2~ ------------------------- */
+
+static t_class *nlms2_tilde_class;
+
+typedef struct _nlms2
+{
+  t_object x_obj;
+  t_float f;
+  t_atom *coef;
+  t_sample *buf;
+  t_sample *y_tmp;
+  t_sample *e_tmp;
+  t_int bufsize;
+  t_outlet *c_out;
+  int adapt; // enable/disable adaptation
+  
+  t_int N; //number of coefficients of the adaptive system
+  t_float *c; // coefficients of the system
+  t_float mu; // step-size parameter (learning rate)
+  t_float alpha; // small constant to avoid division by zero
+
+  t_canvas *x_canvas;
+} t_nlms2_tilde;
+
+static void nlms2_tilde_a(t_nlms2_tilde *x, t_floatarg f)
+{
+  x->adapt = (f==0) ? 0 : 1;
+}
+
+static void nlms2_tilde_geta(t_nlms2_tilde *x)
+{
+  if(x->adapt==0)
+    post("nlms2~: adaptation is currently OFF");
+  else
+    post("nlms2~: adaptation is currently ON");
+}
+
+static void nlms2_tilde_mu(t_nlms2_tilde *x, t_floatarg f)
+{
+  x->mu = f;
+}
+
+static void nlms2_tilde_getmu(t_nlms2_tilde *x)
+{
+  post("mu (step-size parameter): %f", x->mu);
+}
+
+static void nlms2_tilde_alpha(t_nlms2_tilde *x, t_floatarg f)
+{
+  x->alpha = f;
+}
+
+static void nlms2_tilde_getalpha(t_nlms2_tilde *x)
+{
+  post("alpha: %f", x->alpha);
+}
+
+static void nlms2_tilde_getN(t_nlms2_tilde *x)
+{
+  post("N (number of coefficients): %d", x->N);
+}
+
+static void nlms2_tilde_clear(t_nlms2_tilde *x)
+{
+  int i;
+  
+  // clear coefficients
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void nlms2_tilde_init(t_nlms2_tilde *x)
+{
+  int i;
+  
+  // set the first coefficient to 1, all others to 0
+  // so this is a delay free transmission
+  x->c[0] = 1;
+  for(i=1; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffers
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void nlms2_tilde_print(t_nlms2_tilde *x)
+{
+  int i;
+  
+  // print coefficients
+  post("\nNr. of coefficients: %d",x->N);
+  post("coefficients:");
+  for(i=0; i<x->N; i++)
+    post("\t%d: %f",i,x->c[i]);
+}
+
+static void nlms2_tilde_write(t_nlms2_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+
+  // save to file
+  adaptation_write(filename, x->N, x->mu, x->c);
+}
+
+static void nlms2_tilde_read(t_nlms2_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  int n = x->N;
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+  
+  // read file
+  adaptation_read(filename, &x->N, &x->mu, x->c, x->buf);
+  
+  // if length changes:
+  if(x->N != n)
+  {
+    if(x->coef) freebytes(x->coef, sizeof(t_atom) * x->N);
+    x->coef = (t_atom *)getbytes(sizeof(t_atom) * x->N);
+  }
+}
+
+static t_int *nlms2_tilde_perform(t_int *w)
+{
+  t_sample *x_ = (t_sample *)(w[1]);
+  t_sample *d_ = (t_sample *)(w[2]);
+  t_sample *y_ = (t_sample *)(w[3]);
+  t_sample *e_ = (t_sample *)(w[4]);
+  int n = (int)(w[5]);
+  t_nlms2_tilde *x = (t_nlms2_tilde *)(w[6]);
+  int i, j, tmp;
+  t_sample x_2;
+  
+  
+  for(i=0; i<n; i++)
+  {
+    // calc output (filter)
+    
+    x->y_tmp[i]=0;
+    
+    // y_[i] += x->c[j] * x_[i-j];
+    // so lets split in two halfs, so that
+    // negative indezes get samples from the
+    // last audioblock (x->buf) ...
+    tmp = (i+1 - x->N)*(-1);
+    tmp = tmp<0 ? 0 : tmp;
+    
+    for(j=0; j<x->N-tmp; j++)
+      x->y_tmp[i] += x->c[j] * x_[i-j];
+    
+    for(j=x->N-tmp; j<x->N; j++)
+      x->y_tmp[i] += x->c[j] * x->buf[(i-j)*(-1)-1];
+    
+    if(x->adapt)
+    {
+      x_2=0;
+      
+      // error computation
+      x->e_tmp[i] = d_[i] - x->y_tmp[i];
+        
+      // Normalized LMS Adaptmsation Algorithm
+      // (split in the same way as above)
+      //
+      // c[n] = c[n-1] + mu/(alpha + x'[n]*x[n])*e[n]*x[n]
+
+      // calc x'[n]*x[n]
+
+      for(j=0; j<x->N-tmp; j++)
+        x_2 += x_[i-j] * x_[i-j];
+      for(j=x->N-tmp; j<x->N; j++)
+        x_2 += x->buf[(i-j)*(-1)-1] * x->buf[(i-j)*(-1)-1];
+      
+
+      for(j=0; j<x->N-tmp; j++)
+        x->c[j] = x->c[j] + x->mu/(x->alpha+x_2) * x_[i-j] * x->e_tmp[i];
+    
+      for(j=x->N-tmp; j<x->N; j++)
+        x->c[j] = x->c[j] + x->mu/(x->alpha+x_2) * x->buf[(i-j)*(-1)-1] * x->e_tmp[i];
+    }
+    else x->e_tmp[i] = 0;
+    
+    //post("%d: in %f, d: %f, out: %f, e: %f, c1:%f, c2:%f", i, x_[i], d_[i], x->y_tmp[i], x->e_tmp[i], x->c[0], x->c[1]);
+  }
+
+  // outlet coefficients
+  for(i=0; i<x->N; i++)
+    SETFLOAT(&x->coef[i],x->c[i]);
+  
+  outlet_list(x->c_out, &s_list, x->N, x->coef);
+  
+  // store last samples for next audiobuffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = x_[n-1-i];
+  
+  // now write to outlets
+  while(n--)
+  {
+    y_[n] = x->y_tmp[n];
+    e_[n] = x->e_tmp[n];
+  }
+  
+  return (w+7);
+}
+
+static void nlms2_tilde_dsp(t_nlms2_tilde *x, t_signal **sp)
+{
+  // allocate new temp buffer if buffersize changes
+  if(x->bufsize != sp[0]->s_n)
+  {
+    if(sp[0]->s_n < x->N)
+      post("nlms2~ WARNING: buffersize must be bigger than N, you will get wrong results !!!");
+    
+    if(x->y_tmp) freebytes(x->y_tmp, sizeof(t_sample) * x->bufsize);
+    x->y_tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    if(x->e_tmp) freebytes(x->e_tmp, sizeof(t_sample) * x->bufsize);
+    x->e_tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    x->bufsize =  sp[0]->s_n;
+  }
+
+  dsp_add(nlms2_tilde_perform, 6, sp[0]->s_vec, sp[1]->s_vec, 
+          sp[2]->s_vec, sp[3]->s_vec, sp[0]->s_n, x);
+}
+
+static void nlms2_tilde_helper(void)
+{
+  post("\nnlms2~: Adaptive transversal filter using normalized LMS");
+  post("INPUT:");
+  post("\tinlet1: input signal x[n]");
+  post("\tinlet2: desired output signal d[n]");
+  post("\tinit_arg1: number of coefficients of the adaptive system");
+  post("\tinit_arg2, mu: step-size parameter (learning rate)");
+  post("OUTPUT:");
+  post("\toutlet1: output signal");
+  post("\toutlet2: error signal e[n]");
+  post("\toutlet3: coefficients c[n] (only per block)\n");
+}
+
+static void *nlms2_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_nlms2_tilde *x = (t_nlms2_tilde *)pd_new(nlms2_tilde_class);
+  int i;
+  
+  // default values:
+  x->N = 8;
+  x->mu = 0.05;
+  x->alpha = 0.0001;
+  x->adapt = 0;
+  x->y_tmp = NULL;
+  x->e_tmp = NULL;
+  x->bufsize = 0;
+  
+  switch(argc)
+  {
+    case 2:
+      x->mu = atom_getfloat(argv+1);
+    case 1:
+      x->N = atom_getint(argv);
+      x->N = (x->N<=0) ? 1 : x->N;
+  }
+  
+  // allocate mem and init coefficients
+  x->c = (t_float *)getbytes(sizeof(t_float) * x->N);
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // allocate mem for temp buffer
+  x->buf = (t_sample *)getbytes(sizeof(t_sample) * x->N-1);
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+
+  // for output atoms (coefficients):
+  x->coef = (t_atom *)getbytes(sizeof(t_atom) * x->N);
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  x->c_out = outlet_new(&x->x_obj, 0);
+
+  x->x_canvas = canvas_getcurrent();
+
+  return (x);
+}
+
+static void nlms2_tilde_free(t_nlms2_tilde *x)
+{
+  if(x->c) freebytes(x->c, sizeof(t_float) * x->N);
+  if(x->buf) freebytes(x->buf, sizeof(t_sample) * x->N-1);
+  if(x->y_tmp) freebytes(x->y_tmp, sizeof(t_sample) * x->bufsize);
+  if(x->e_tmp) freebytes(x->e_tmp, sizeof(t_sample) * x->bufsize);
+  if(x->coef) freebytes(x->coef, sizeof(t_atom) * x->N);
+}
+
+void nlms2_tilde_setup(void)
+{
+  nlms2_tilde_class = class_new(gensym("nlms2~"), (t_newmethod)nlms2_tilde_new, 
+                    (t_method)nlms2_tilde_free, sizeof(t_nlms2_tilde), 
+                    CLASS_DEFAULT, A_GIMME, 0);
+
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_a,
+                  gensym("adaptation"), A_DEFFLOAT, 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_geta,
+                  gensym("getadaptation"), 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_mu, 
+                  gensym("mu"), A_DEFFLOAT, 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_getmu,
+                  gensym("getmu"), 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_alpha, 
+                  gensym("alpha"), A_DEFFLOAT, 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_getalpha,
+                  gensym("getalpha"), 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_getN,
+                  gensym("getN"), 0); 
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_init,
+                  gensym("init_unity"), 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_clear,
+                  gensym("clear"), 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_print,
+                  gensym("print"), 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_write, 
+                  gensym("write"), A_DEFSYMBOL, 0);
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_read, 
+                  gensym("read"), A_DEFSYMBOL, 0);
+
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(nlms2_tilde_class, t_nlms2_tilde, f);
+  
+  class_addmethod(nlms2_tilde_class, (t_method)nlms2_tilde_helper, gensym("help"), 0);
+}
diff --git a/adaptive/src/nlms3~.c b/adaptive/src/nlms3~.c
new file mode 100755
index 0000000..a1857a2
--- /dev/null
+++ b/adaptive/src/nlms3~.c
@@ -0,0 +1,423 @@
+/******************************************************
+ *
+ * Adaptive Systems for PD
+ *
+ * copyleft (c) Gerda Strobl, Georg Holzmann
+ * 2005
+ *
+ * for complaints, suggestions: grh@mur.at
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+#include "adaptive.h"
+
+
+/* ------------------------ nlms3~ ------------------------- */
+
+static t_class *nlms3_tilde_class;
+
+typedef struct _nlms3
+{
+  t_object x_obj;
+  t_float f;
+  t_atom *coef;
+  t_sample *buf;
+  t_sample *xbuf;
+  t_sample *in_tmp;
+  t_sample *y_tmp;
+  t_sample *e_tmp;
+  t_int bufsize;
+  t_outlet *c_out;
+  int adapt; // enable/disable adaptation
+  
+  t_int N; //number of coefficients of the adaptive system
+  t_float *c; // coefficients of the system
+  t_float mu; // step-size parameter (learning rate)
+  t_float alpha; // small constant to avoid division by zero
+
+  t_canvas *x_canvas;
+} t_nlms3_tilde;
+
+static void nlms3_tilde_a(t_nlms3_tilde *x, t_floatarg f)
+{
+  x->adapt = (f==0) ? 0 : 1;
+  
+  if(!x->adapt)
+  {
+    int i;
+    
+    // clear temp buffers
+    for(i=0; i<x->N-1; i++)
+      x->buf[i] = 0;
+    for(i=0; i<x->N-1; i++)
+      x->xbuf[i] = 0;
+  }
+}
+
+static void nlms3_tilde_geta(t_nlms3_tilde *x)
+{
+  if(x->adapt==0)
+    post("nlms3~: adaptation is currently OFF");
+  else
+    post("nlms3~: adaptation is currently ON");
+}
+
+static void nlms3_tilde_mu(t_nlms3_tilde *x, t_floatarg f)
+{
+  x->mu = f;
+}
+
+static void nlms3_tilde_getmu(t_nlms3_tilde *x)
+{
+  post("mu (step-size parameter): %f", x->mu);
+}
+
+static void nlms3_tilde_alpha(t_nlms3_tilde *x, t_floatarg f)
+{
+  x->alpha = f;
+}
+
+static void nlms3_tilde_getalpha(t_nlms3_tilde *x)
+{
+  post("alpha: %f", x->alpha);
+}
+
+static void nlms3_tilde_getN(t_nlms3_tilde *x)
+{
+  post("N (number of coefficients): %d", x->N);
+}
+
+static void nlms3_tilde_clear(t_nlms3_tilde *x)
+{
+  int i;
+  
+  // clear coefficients
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffers
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+  for(i=0; i<x->N-1; i++)
+    x->xbuf[i] = 0;
+}
+
+static void nlms3_tilde_init(t_nlms3_tilde *x)
+{
+  int i;
+  
+  // set the first coefficient to 1, all others to 0
+  // so this is a delay free transmission
+  x->c[0] = 1;
+  for(i=1; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffers
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+  for(i=0; i<x->N-1; i++)
+    x->xbuf[i] = 0;
+}
+
+static void nlms3_tilde_print(t_nlms3_tilde *x)
+{
+  int i;
+  
+  // print coefficients
+  post("\nNr. of coefficients: %d",x->N);
+  post("coefficients:");
+  for(i=0; i<x->N; i++)
+    post("\t%d: %f",i,x->c[i]);
+}
+
+static void nlms3_tilde_write(t_nlms3_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+
+  // save to file
+  adaptation_write(filename, x->N, x->mu, x->c);
+}
+
+static void nlms3_tilde_read(t_nlms3_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  int n = x->N;
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+  
+  // read file
+  adaptation_read(filename, &x->N, &x->mu, x->c, x->buf);
+  
+  // if length changes:
+  if(x->N != n)
+  {
+    if(x->coef) freebytes(x->coef, sizeof(t_atom) * x->N);
+    x->coef = (t_atom *)getbytes(sizeof(t_atom) * x->N);
+  }
+}
+
+static t_int *nlms3_tilde_perform(t_int *w)
+{
+  t_sample *in_ = (t_sample *)(w[1]);
+  t_sample *x_  = (t_sample *)(w[2]);
+  t_sample *d_  = (t_sample *)(w[3]);
+  t_sample *out_= (t_sample *)(w[4]);
+  t_sample *y_  = (t_sample *)(w[5]);
+  t_sample *e_  = (t_sample *)(w[6]);
+  int n = (int)(w[7]);
+  t_nlms3_tilde *x = (t_nlms3_tilde *)(w[8]);
+  int i, j, tmp;
+  t_sample x_2;
+  
+  
+  // calculate inlet2 (filter+adaptation)
+  if(x->adapt)
+  {
+    for(i=0; i<n; i++)
+    {
+      x->y_tmp[i]=0;
+      x_2=0;
+    
+      // y_[i] += x->c[j] * x_[i-j];
+      // so lets split in two halfs, so that
+      // negative indezes get samples from the
+      // last audioblock (x->buf) ...
+      tmp = (i+1 - x->N)*(-1);
+      tmp = tmp<0 ? 0 : tmp;
+    
+      for(j=0; j<x->N-tmp; j++)
+        x->y_tmp[i] += x->c[j] * x_[i-j];
+    
+      for(j=x->N-tmp; j<x->N; j++)
+        x->y_tmp[i] += x->c[j] * x->xbuf[(i-j)*(-1)-1];
+    
+      // error computation
+      x->e_tmp[i] = d_[i] - x->y_tmp[i];
+        
+      // Normalized LMS Adaptmsation Algorithm
+      // (split in the same way as above)
+      //
+      // c[n] = c[n-1] + mu/(alpha + x'[n]*x[n])*e[n]*x[n]
+
+      // calc x'[n]*x[n]
+
+      for(j=0; j<x->N-tmp; j++)
+        x_2 += x_[i-j] * x_[i-j];
+      for(j=x->N-tmp; j<x->N; j++)
+        x_2 += x->xbuf[(i-j)*(-1)-1] * x->xbuf[(i-j)*(-1)-1];
+      
+      for(j=0; j<x->N-tmp; j++)
+        x->c[j] = x->c[j] + x->mu/(x->alpha+x_2) * x_[i-j] * x->e_tmp[i];
+      for(j=x->N-tmp; j<x->N; j++)
+        x->c[j] = x->c[j] + x->mu/(x->alpha+x_2) * x->xbuf[(i-j)*(-1)-1] * x->e_tmp[i];
+    }
+    
+    // outlet coefficients
+    for(i=0; i<x->N; i++)
+      SETFLOAT(&x->coef[i],x->c[i]);
+  
+    outlet_list(x->c_out, &s_list, x->N, x->coef);
+  
+    // store last samples for next audiobuffer
+    for(i=0; i<x->N-1; i++)
+      x->xbuf[i] = x_[n-1-i];
+  }
+  
+  
+  // calculate filter output (inlet 1)
+  for(i=0; i<n; i++)
+  {
+    x->in_tmp[i]=0;
+    
+    // y_[i] += x->c[j] * x_[i-j];
+    // so lets split in two halfs, so that
+    // negative indezes get samples from the
+    // last audioblock (x->buf) ...
+    tmp = (i+1 - x->N)*(-1);
+    tmp = tmp<0 ? 0 : tmp;
+    
+    for(j=0; j<x->N-tmp; j++)
+      x->in_tmp[i] += x->c[j] * in_[i-j];
+    
+    for(j=x->N-tmp; j<x->N; j++)
+      x->in_tmp[i] += x->c[j] * x->buf[(i-j)*(-1)-1];
+  }
+  // store last samples for next audiobuffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = in_[n-1-i];
+  
+  
+  // write to the outlets
+  if(x->adapt)
+  {
+    while(n--)
+    {
+      out_[n] = x->in_tmp[n];
+      y_[n] = x->y_tmp[n];
+      e_[n] = x->e_tmp[n];
+    }
+  }
+  else
+  {
+    while(n--)
+    {
+      out_[n] = x->in_tmp[n];
+      y_[n] = 0;
+      e_[n] = 0;
+    }
+  }
+
+    
+  return (w+9);
+}
+
+static void nlms3_tilde_dsp(t_nlms3_tilde *x, t_signal **sp)
+{
+  // allocate new temp buffer if buffersize changes
+  if(x->bufsize != sp[0]->s_n)
+  {
+    if(sp[0]->s_n < x->N)
+      post("nlms3~ WARNING: buffersize must be bigger than N, you will get wrong results !!!"); 
+    
+    if(x->in_tmp) freebytes(x->in_tmp, sizeof(t_sample) * x->bufsize);
+    x->in_tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    if(x->y_tmp) freebytes(x->y_tmp, sizeof(t_sample) * x->bufsize);
+    x->y_tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    if(x->e_tmp) freebytes(x->e_tmp, sizeof(t_sample) * x->bufsize);
+    x->e_tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    x->bufsize =  sp[0]->s_n;
+  }
+
+  dsp_add(nlms3_tilde_perform, 8, sp[0]->s_vec, sp[1]->s_vec, 
+          sp[2]->s_vec, sp[3]->s_vec, sp[4]->s_vec, 
+          sp[5]->s_vec, sp[0]->s_n, x);
+}
+
+static void nlms3_tilde_helper(void)
+{
+  post("\nnlms3~: Adaptive transversal filter using normalized LMS");
+  post("INPUT:");
+  post("\tinlet1: input signal without adaptation, only filter");
+  post("\tinlet2: input signal for adaptation x[n]");
+  post("\tinlet3: desired output signal d[n]");
+  post("\tinit_arg1: number of coefficients of the adaptive system");
+  post("\tinit_arg2, mu: step-size parameter (learning rate)");
+  post("OUTPUT:");
+  post("\toutlet1: output signal from inlet1");
+  post("\toutlet2: output signal from inlet2");
+  post("\toutlet3: error signal e[n]");
+  post("\toutlet4: coefficients c[n] (only per block)\n");
+}
+
+static void *nlms3_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_nlms3_tilde *x = (t_nlms3_tilde *)pd_new(nlms3_tilde_class);
+  int i;
+  
+  // default values:
+  x->N = 8;
+  x->mu = 0.05;
+  x->alpha = 0.000001;
+  x->adapt = 0;
+  x->in_tmp = NULL;
+  x->y_tmp = NULL;
+  x->e_tmp = NULL;
+  x->bufsize = 0;
+  
+  switch(argc)
+  {
+    case 2:
+      x->mu = atom_getfloat(argv+1);
+    case 1:
+      x->N = atom_getint(argv);
+      x->N = (x->N<=0) ? 1 : x->N;
+  }
+  
+  // allocate mem and init coefficients
+  x->c = (t_float *)getbytes(sizeof(t_float) * x->N);
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // allocate mem for temp buffers
+  x->buf = (t_sample *)getbytes(sizeof(t_sample) * x->N-1);
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+  x->xbuf = (t_sample *)getbytes(sizeof(t_sample) * x->N-1);
+  for(i=0; i<x->N-1; i++)
+    x->xbuf[i] = 0;
+
+  // for output atoms (coefficients):
+  x->coef = (t_atom *)getbytes(sizeof(t_atom) * x->N);
+  
+  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);
+  outlet_new(&x->x_obj, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  x->c_out = outlet_new(&x->x_obj, 0);
+
+  x->x_canvas = canvas_getcurrent();
+
+  return (x);
+}
+
+static void nlms3_tilde_free(t_nlms3_tilde *x)
+{
+  if(x->c) freebytes(x->c, sizeof(t_float) * x->N);
+  if(x->buf) freebytes(x->buf, sizeof(t_sample) * x->N-1);
+  if(x->xbuf) freebytes(x->xbuf, sizeof(t_sample) * x->N-1);
+  if(x->in_tmp) freebytes(x->y_tmp, sizeof(t_sample) * x->bufsize);
+  if(x->y_tmp) freebytes(x->y_tmp, sizeof(t_sample) * x->bufsize);
+  if(x->e_tmp) freebytes(x->e_tmp, sizeof(t_sample) * x->bufsize);
+  if(x->coef) freebytes(x->coef, sizeof(t_atom) * x->N);
+}
+
+void nlms3_tilde_setup(void)
+{
+  nlms3_tilde_class = class_new(gensym("nlms3~"), (t_newmethod)nlms3_tilde_new, 
+                    (t_method)nlms3_tilde_free, sizeof(t_nlms3_tilde), 
+                    CLASS_DEFAULT, A_GIMME, 0);
+
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_a,
+                  gensym("adaptation"), A_DEFFLOAT, 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_geta,
+                  gensym("getadaptation"), 0);  
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_mu, 
+                  gensym("mu"), A_DEFFLOAT, 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_getmu,
+                  gensym("getmu"), 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_alpha, 
+                  gensym("alpha"), A_DEFFLOAT, 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_getalpha,
+                  gensym("getalpha"), 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_getN,
+                  gensym("getN"), 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_init,
+                  gensym("init_unity"), 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_clear,
+                  gensym("clear"), 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_print,
+                  gensym("print"), 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_write, 
+                  gensym("write"), A_DEFSYMBOL, 0);
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_read, 
+                  gensym("read"), A_DEFSYMBOL, 0);
+
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(nlms3_tilde_class, t_nlms3_tilde, f);
+  
+  class_addmethod(nlms3_tilde_class, (t_method)nlms3_tilde_helper, gensym("help"), 0);
+}
diff --git a/adaptive/src/nlms~.c b/adaptive/src/nlms~.c
new file mode 100755
index 0000000..5ebc4f5
--- /dev/null
+++ b/adaptive/src/nlms~.c
@@ -0,0 +1,324 @@
+/******************************************************
+ *
+ * Adaptive Systems for PD
+ *
+ * copyleft (c) Gerda Strobl, Georg Holzmann
+ * 2005
+ *
+ * for complaints, suggestions: grh@mur.at
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+#include "adaptive.h"
+
+
+/* ------------------------ nlms~ ------------------------- */
+
+static t_class *nlms_tilde_class;
+
+typedef struct _nlms
+{
+  t_object x_obj;
+  t_float f;
+  t_sample *buf;
+  t_sample *tmp;
+  t_int bufsize;
+  int adapt; // enable/disable adaptation
+  
+  t_int N; //number of coefficients of the adaptive system
+  t_float *c; // coefficients of the system
+  t_float mu; // step-size parameter (learning rate)
+  t_float alpha; // small constant to avoid division by zero
+
+  t_canvas *x_canvas;
+} t_nlms_tilde;
+
+static void nlms_tilde_a(t_nlms_tilde *x, t_floatarg f)
+{
+  x->adapt = (f==0) ? 0 : 1;
+}
+
+static void nlms_tilde_geta(t_nlms_tilde *x)
+{
+  if(x->adapt==0)
+    post("nlms~: adaptation is currently OFF");
+  else
+    post("nlms~: adaptation is currently ON");
+}
+
+static void nlms_tilde_mu(t_nlms_tilde *x, t_floatarg f)
+{
+  x->mu = f;
+}
+
+static void nlms_tilde_getmu(t_nlms_tilde *x)
+{
+  post("mu (step-size parameter): %f", x->mu);
+}
+
+static void nlms_tilde_alpha(t_nlms_tilde *x, t_floatarg f)
+{
+  x->alpha = f;
+}
+
+static void nlms_tilde_getalpha(t_nlms_tilde *x)
+{
+  post("alpha: %f", x->alpha);
+}
+
+static void nlms_tilde_getN(t_nlms_tilde *x)
+{
+  post("N (number of coefficients): %d", x->N);
+}
+
+static void nlms_tilde_clear(t_nlms_tilde *x)
+{
+  int i;
+  
+  // clear coefficients
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void nlms_tilde_init(t_nlms_tilde *x)
+{
+  int i;
+  
+  // set the first coefficient to 1, all others to 0
+  // so this is a delay free transmission
+  x->c[0] = 1;
+  for(i=1; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffers
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void nlms_tilde_print(t_nlms_tilde *x)
+{
+  int i;
+  
+  // print coefficients
+  post("\nNr. of coefficients: %d",x->N);
+  post("coefficients:");
+  for(i=0; i<x->N; i++)
+    post("\t%d: %f",i,x->c[i]);
+}
+
+static void nlms_tilde_write(t_nlms_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+
+  // save to file
+  adaptation_write(filename, x->N, x->mu, x->c);
+}
+
+static void nlms_tilde_read(t_nlms_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+  
+  // read file
+  adaptation_read(filename, &x->N, &x->mu, x->c, x->buf);
+}
+
+static t_int *nlms_tilde_perform(t_int *w)
+{
+  t_nlms_tilde *x = (t_nlms_tilde *)(w[1]);
+  t_sample *x_ = (t_sample *)(w[2]);
+  t_sample *d_ = (t_sample *)(w[3]);
+  t_sample *y_ = (t_sample *)(w[4]);
+  int n = (int)(w[5]);
+  int i, j, tmp;
+  t_sample e=0, x_2;
+  
+  
+  for(i=0; i<n; i++)
+  {
+    // calc output (filter)
+    
+    x->tmp[i]=0;
+    
+    // y_[i] += x->c[j] * x_[i-j];
+    // so lets split in two halfs, so that
+    // negative indezes get samples from the
+    // last audioblock (x->buf) ...
+    tmp = (i+1 - x->N)*(-1);
+    tmp = tmp<0 ? 0 : tmp;
+    
+    for(j=0; j<x->N-tmp; j++)
+      x->tmp[i] += x->c[j] * x_[i-j];
+    
+    for(j=x->N-tmp; j<x->N; j++)
+      x->tmp[i] += x->c[j] * x->buf[(i-j)*(-1)-1];
+    
+    if(x->adapt)
+    {
+      x_2=0;
+      
+      // error computation
+      e =d_[i] - x->tmp[i];
+        
+      // Normalized LMS Adaptmsation Algorithm
+      // (split in the same way as above)
+      //
+      // c[n] = c[n-1] + mu/(alpha + x'[n]*x[n])*e[n]*x[n]
+
+      // calc x'[n]*x[n]
+      // TODO: Performance Optimization: save results from the past
+      // so that this for loop should be obsolet ...
+      for(j=0; j<x->N-tmp; j++)
+        x_2 += x_[i-j] * x_[i-j];
+      for(j=x->N-tmp; j<x->N; j++)
+        x_2 += x->buf[(i-j)*(-1)-1] * x->buf[(i-j)*(-1)-1];
+      
+
+      for(j=0; j<x->N-tmp; j++)
+        x->c[j] = x->c[j] + x->mu/(x->alpha+x_2) * x_[i-j] * e;
+    
+      for(j=x->N-tmp; j<x->N; j++)
+        x->c[j] = x->c[j] + x->mu/(x->alpha+x_2) * x->buf[(i-j)*(-1)-1] * e;
+    }
+    
+    //post("%d: in %f, d: %f, out: %f, error: %f, c1:%f, c2:%f", i, x_[i], d_[i], x->tmp[i], e, x->c[0], x->c[1]);
+  }
+
+  // store last samples for next audiobuffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = x_[n-1-i];
+  
+  // now write tmp to outlet
+  while(n--)
+    y_[n] = x->tmp[n];
+  
+  return (w+6);
+}
+
+static void nlms_tilde_dsp(t_nlms_tilde *x, t_signal **sp)
+{
+  // allocate new temp buffer if buffersize changes
+  if(x->bufsize != sp[0]->s_n)
+  {
+    if(sp[0]->s_n < x->N)
+      post("nlms~ WARNING: buffersize must be bigger than N, you will get wrong results !!!");
+    
+    if(x->tmp) freebytes(x->tmp, sizeof(t_sample) * x->bufsize);
+    x->tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    x->bufsize =  sp[0]->s_n;
+  }
+
+  dsp_add(nlms_tilde_perform, 5, x, sp[0]->s_vec, sp[1]->s_vec, 
+	  sp[2]->s_vec, sp[0]->s_n);
+}
+
+static void nlms_tilde_helper(void)
+{
+  post("\nnlms~: Adaptive transversal filter using normalized LMS");
+  post("INPUT:");
+  post("\tinlet1: input signal x[n]");
+  post("\tinlet2: desired output signal d[n]");
+  post("\tinit_arg1: number of coefficients of the adaptive system");
+  post("\tinit_arg2, mu: step-size parameter (learning rate)");
+  post("OUTPUT:");
+  post("\toutlet1: output signal\n");
+}
+
+static void *nlms_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_nlms_tilde *x = (t_nlms_tilde *)pd_new(nlms_tilde_class);
+  int i;
+  
+  // default values:
+  x->N = 8;
+  x->mu = 0.05;
+  x->alpha = 0.0001;
+  x->adapt = 0;
+  x->tmp = NULL;
+  x->bufsize = 0;
+  
+  switch(argc)
+  {
+    case 2:
+      x->mu = atom_getfloat(argv+1);
+    case 1:
+      x->N = atom_getint(argv);
+      x->N = (x->N<=0) ? 1 : x->N;
+  }
+  
+  // allocate mem and init coefficients
+  x->c = (t_float *)getbytes(sizeof(t_float) * x->N);
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // allocate mem for temp buffer
+  x->buf = (t_sample *)getbytes(sizeof(t_sample) * x->N-1);
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_canvas = canvas_getcurrent();
+
+  return (x);
+}
+
+static void nlms_tilde_free(t_nlms_tilde *x)
+{
+  if(x->c) freebytes(x->c, sizeof(t_float) * x->N);
+  if(x->buf) freebytes(x->buf, sizeof(t_sample) * x->N-1);
+  if(x->tmp) freebytes(x->tmp, sizeof(t_sample) * x->bufsize);
+}
+
+void nlms_tilde_setup(void)
+{
+  nlms_tilde_class = class_new(gensym("nlms~"), (t_newmethod)nlms_tilde_new, 
+                    (t_method)nlms_tilde_free, sizeof(t_nlms_tilde), 
+                    CLASS_DEFAULT, A_GIMME, 0);
+
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_a,
+                  gensym("adaptation"), A_DEFFLOAT, 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_geta,
+                  gensym("getadaptation"), 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_mu, 
+                  gensym("mu"), A_DEFFLOAT, 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_getmu,
+                  gensym("getmu"), 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_alpha, 
+                  gensym("alpha"), A_DEFFLOAT, 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_getalpha,
+                  gensym("getalpha"), 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_getN,
+                  gensym("getN"), 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_init,
+                  gensym("init_unity"), 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_clear,
+                  gensym("clear"), 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_print,
+                  gensym("print"), 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_write, 
+                  gensym("write"), A_DEFSYMBOL, 0);
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_read, 
+                  gensym("read"), A_DEFSYMBOL, 0);
+
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(nlms_tilde_class, t_nlms_tilde, f);
+  
+  class_addmethod(nlms_tilde_class, (t_method)nlms_tilde_helper, gensym("help"), 0);
+}