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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", -10, -96, 96, 0.1); // dB
pan = hslider("pan", 0, -1, 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
bend = hslider("pitch bend", 0, -2, 2, 0.01);// semitones
/* 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*pow(2,bend/12))))
: dcblocker
: vgroup("3-master", *(db2linear(vol)) : panner((pan+1)/2));
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