OSC0 = base freq OSC1 = cutof OSC2 = reso The reso retrigger should not re-enable. Is that so? YES! : osc2 restart2 synth sync:0->2 high? if bus:2 low \ if synced to 0, do one shot else bus:2 toggle \ else just osc then bus>audio ; So the mixing is symmetric: OSC0 xor (OSC1 and OSC2) but the retriggering is not. This can also do other kinds of pulse tricks.