Hi alex, On Synth-DIY, You wrote: > does anyone know what > is the 606 expecting as far as a footswitch? In another note, I sent you part of the TR606 schematics. On the left side, there is a jack labeled "RUN/STOP". Based on the circuit, I gather that the jack expects an normally closed pedal that opens the circuit when you press the pedal. -Dan G.