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diff --git a/externals/grill/vasp/source/ops_arith.cpp b/externals/grill/vasp/source/ops_arith.cpp
new file mode 100644
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+++ b/externals/grill/vasp/source/ops_arith.cpp
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+/* 
+
+VASP modular - vector assembling signal processor / objects for Max/MSP and PD
+
+Copyright (c) 2002 Thomas Grill (xovo@gmx.net)
+For information on usage and redistribution, and for a DISCLAIMER OF ALL
+WARRANTIES, see the file, "license.txt," in this distribution.  
+
+*/
+
+#include "ops_arith.h"
+#include "opdefs.h"
+#include "util.h"
+#include <math.h>
+
+template<class T> inline V f_radd(T &v,T a,T b) { v = a+b; }
+template<class T> inline V f_rsub(T &v,T a,T b) { v = a-b; }
+template<class T> inline V f_rsubr(T &v,T a,T b) { v = b-a; }
+template<class T> inline V f_rmul(T &v,T a,T b) { v = a*b; }
+template<class T> inline V f_rdiv(T &v,T a,T b) { v = a/b; }
+template<class T> inline V f_rdivr(T &v,T a,T b) { v = b/a; }
+template<class T> inline V f_rmod(T &v,T a,T b) { v = fmod(a,b); }
+
+BL VecOp::d_add(OpParam &p) { D__rbin(f_radd<S>,p); }
+BL VecOp::d_sub(OpParam &p) { D__rbin(f_rsub<S>,p); }
+BL VecOp::d_subr(OpParam &p) { D__rbin(f_rsubr<S>,p); }
+BL VecOp::d_mul(OpParam &p) { D__rbin(f_rmul<S>,p); }
+BL VecOp::d_div(OpParam &p) { D__rbin(f_rdiv<S>,p); }
+BL VecOp::d_divr(OpParam &p) { D__rbin(f_rdivr<S>,p); }
+BL VecOp::d_mod(OpParam &p) { D__rbin(f_rmod<S>,p); }
+
+
+VASP_BINARY("vasp.+",add,true,VASP_ARG_R(0),"Adds a value, envelope or vasp")
+VASP_BINARY("vasp.-",sub,true,VASP_ARG_R(0),"Subtracts a value, envelope or vasp")
+VASP_BINARY("vasp.!-",subr,true,VASP_ARG_R(0),"Reverse subtracts a value, envelope or vasp")
+VASP_BINARY("vasp.*",mul,true,VASP_ARG_R(1),"Multiplies with a value, envelope or vasp")
+VASP_BINARY("vasp./",div,true,VASP_ARG_R(1),"Divides by a value, envelope or vasp")
+VASP_BINARY("vasp.!/",divr,true,VASP_ARG_R(1),"Reverse divides by a value, envelope or vasp")
+VASP_BINARY("vasp.%",mod,true,VASP_ARG_R(0),"Calculates the remainder of the division by a value, envelope or vasp")
+
+// -----------------------------------------------------
+
+template<class T> inline V f_rsqr(T &v,T a) { v = a*a; } 
+template<class T> inline V f_rssqr(T &v,T a) { v = a*fabs(a); } 
+
+BL VecOp::d_sqr(OpParam &p) { D__run(f_rsqr<S>,p); }
+BL VecOp::d_ssqr(OpParam &p) { d__run(f_rssqr<S>,p); }
+
+VASP_UNARY("vasp.sqr",sqr,true,"Calculates the square") 
+VASP_UNARY("vasp.ssqr",ssqr,true,"Calculates the square with preservation of the sign") 
+
+
+// -----------------------------------------------------
+
+template<class T> inline V f_rsign(T &v,T a) { v = (a == 0?0:(a < 0?-1.:1.)); }  
+template<class T> inline V f_rabs(T &v,T a) { v = fabs(a); }  
+
+BL VecOp::d_sign(OpParam &p) { D__run(f_rsign<S>,p); }
+BL VecOp::d_abs(OpParam &p) { D__run(f_rabs<S>,p); }
+
+
+VASP_UNARY("vasp.sign",sign,true,"Calculates the sign (signum function)") 
+VASP_UNARY("vasp.abs",abs,true,"Calulates the absolute value") 
+