--- /dev/null
+
+/* Stereo chorus. */
+
+declare name "chorus -- stereo chorus effect";
+declare author "Albert Graef";
+declare version "1.0";
+
+import("music.lib");
+
+level = hslider("level", 0.5, 0, 1, 0.01);
+freq = hslider("freq", 3, 0, 10, 0.01);
+dtime = hslider("delay", 0.025, 0, 0.2, 0.001);
+depth = hslider("depth", 0.02, 0, 1, 0.001);
+
+tblosc(n,f,freq,mod) = (1-d)*rdtable(n,waveform,i&(n-1)) +
+ d*rdtable(n,waveform,(i+1)&(n-1))
+with {
+ waveform = time*(2.0*PI)/n : f;
+ phase = freq/SR : (+ : decimal) ~ _;
+ modphase = decimal(phase+mod/(2*PI))*n;
+ i = int(floor(modphase));
+ d = decimal(modphase);
+};
+
+chorus(dtime,freq,depth,phase,x)
+ = x+level*fdelay(1<<16, t, x)
+with {
+ t = SR*dtime/2*(1+depth*tblosc(1<<16, sin, freq, phase));
+};
+
+process = vgroup("chorus", (left, right))
+with {
+ left = chorus(dtime,freq,depth,0);
+ right = chorus(dtime,freq,depth,PI/2);
+};