I have a couple boss Ds-1 pedals. I want to modify them to an early JHS Synth Drive but have a momentary switch.

I ordered most of the parts my only issue would be wiring the momentary switch. It is a “Normally open Switch”. I can place it between S2 and R10 connector but it would open circuit. I would need another SPDT switch that engages the switch so that it works in both modes.

With extra switch disengaged it would work like a normal synth drive, turning any of the side switches engages an effect.

With the extra switch engaged. The effect would only turn on when the momentary switch is turned on.

And I would clean out all the ceramic caps with film caps. Looks like there is about 6 of them. I’ll document everything also.

Momentary switch would go on top of by foot pedal, inside battery compartment. I have a adaptor to 9v I can use if