interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/synth/fuzz.dsp

   1
   2 /* A simple waveshaping effect. */
   3
   4 declare name "fuzz -- a simple distortion effect";
   5 declare author "Bram de Jong (from musicdsp.org)";
   6 declare version "1.0";
   7
   8 import("music.lib");
   9
  10 dist    = hslider("distortion", 12, 0, 100, 0.1);       // distortion parameter
  11 gain    = hslider("gain", 3, -96, 96, 0.1);             // output gain (dB)
  12
  13 // the waveshaping function
  14 f(a,x)  = x*(abs(x) + a)/(x*x + (a-1)*abs(x) + 1);
  15
  16 // gain correction factor to compensate for distortion
  17 g(a)    = 1/sqrt(a+1);
  18
  19 process = vgroup("dist", (out, out))
  20 with { out(x) = db2linear(gain)*g(dist)*f(db2linear(dist),x); };