-
-declare name "karplus -- Karplus-Strong string synth";
-declare author "Yann Orlarey";
-declare version "1.0";
-
-import("music.lib");
-
-// control variables
-
-// master volume and pan
-vol = hslider("vol", 0.3, 0, 10, 0.01); // %
-pan = hslider("pan", 0.5, 0, 1, 0.01); // %
-
-// excitator and resonator parameters
-size = hslider("samples", 512, 1, 1024, 1); // #samples
-dtime = hslider("decay time", 4, 0, 10, 0.01);// -60db decay time
-
-// voice parameters
-freq = nentry("freq", 440, 20, 20000, 1); // Hz
-gain = nentry("gain", 1, 0, 10, 0.01); // %
-gate = button("gate"); // 0/1
-
-/* The excitator: */
-
-upfront(x) = (x-x') > 0.0;
-decay(n,x) = x - (x>0)/n;
-release(n) = + ~ decay(n);
-trigger(n) = upfront : release(n) : >(0.0) : +(leak);
-leak = 1.0/65536.0; // avoid denormals on Pentium
-excitator = trigger(size);
-
-/* The resonator: */
-
-average(x) = (x+x')/2;
-att(d,t) = 1-1/pow(db2linear(60), d/(SR*t));
-comb(d,a) = (+ : fdelay(4096, d-1.5)) ~ (average : *(1.0-a));
-resonator(d) = comb(d,att(d,dtime));
-
-/* DC blocker (see http://ccrma.stanford.edu/~jos/filters/DC_Blocker.html): */
-
-dcblocker(x) = (x-x') : (+ ~ *(0.995));
-
-/* Karplus-Strong string synthesizer: */
-
-process = vgroup("1-excitator", noise*gain : *(gate : excitator))
- : vgroup("2-resonator", resonator(SR/freq)) : dcblocker
- : vgroup("3-master", *(vol) : panner(pan));