DIY bass pedal synth

[Ingo Debus]

Hallgeir Helland wrote:
> And, what is the best way to make a preset-type synth? I was thinking
> along the lines of the Yamaha CS-80: one set of "normal" knobs, and
> three sets of miniature controls (trimpots) under a hatch. And then
> somehow switch between the settings.  Do I need to have every paremeter
> voltage controllable? Will a CMOS switching system be best, or will it
> be easier with many-poled mechanical switches?

You don't need a many-poled switch for this. If you have only positive
CVs you can run each CV from the pot's wiper though a diode. Then
connect only one of the several control panels to the positive power
supply at a time. So you need only a one-pole switch.

Ingo