The deal is that it buffers up all the notes played during a given measure, and then plays all of them at once at the beginning of the following measure, again an octave down.
The patch is white noise through a pitched resonance filter, with a rather soft-attack envelope.
(var on;
on = NoteOnResponder({ |src, chan, num, veloc| f.value(num); });
q = { on.remove; };)
q.value;
(SynthDef(\my_osc, {
|freq = 400|
var amp = 0.8 * EnvGen.kr(Env.adsr(0.1,0.7,0), Line.kr(1,0,0.7), doneAction: 2 );
Out.ar(0, Splay.ar(Resonz.ar(WhiteNoise.ar(amp), freq, 0.025)));
}).send(s))
x = Synth(\my_osc);
t = TempoClock.new();
t.tempo_(1);
f = { |z| Synth(\my_osc, [\freq, z.midicps]); t.play({ Synth(\my_osc, [\freq, (z-12).midicps])}); };