interpretor/preprocessor/faust-0.9.47mr3/examples/karplus32.dsp

   1 declare name            "karplus32";
   2 declare version         "1.0";
   3 declare author          "Grame";
   4 declare license         "BSD";
   5 declare copyright       "(c)GRAME 2006";
   6
   7
   8 //-----------------------------------------------
   9 //                              karplus-strong
  10 //              with 32 resonators in parallel
  11 //-----------------------------------------------
  12
  13 import("music.lib");
  14
  15
  16 // Excitator
  17 //--------
  18
  19 upfront(x)      = (x-x') > 0.0;
  20 decay(n,x)      = x - (x>0)/n;
  21 release(n)      = + ~ decay(n);
  22 trigger(n)      = upfront : release(n) : >(0.0) : +(leak);
  23 leak            = 1.0/65536.0;
  24
  25 size            = hslider("excitation (samples)", 128, 2, 512, 1);
  26
  27
  28
  29
  30 // Resonator
  31 //-----------------
  32
  33 dur             = hslider("duration (samples)", 128, 2, 512, 1);
  34 att             = hslider("attenuation", 0.1, 0, 1, 0.01);
  35 average(x)      = (x+x')/2;
  36
  37 resonator(d, a) = (+ : delay(4096, d-1.5)) ~ (average : *(1.0-a)) ;
  38
  39
  40 // Polyphony
  41 //-----------------
  42
  43 detune          = hslider("detune", 32, 0, 512, 1);
  44 polyphony       = hslider("polyphony", 1, 0, 32, 1);
  45
  46
  47
  48 output          = hslider("output volume", 0.5, 0, 1, 0.1);
  49
  50
  51 process =  vgroup("karplus32",
  52                                 vgroup("noise generator", noise * hslider("level", 0.5, 0, 1, 0.1))
  53                                  : vgroup("excitator", *(button("play"): trigger(size)))
  54                                 <: vgroup("resonator x32", par(i,32, resonator(dur+i*detune, att) * (polyphony > i)))
  55                                 :> *(output),*(output)
  56                         );