Hi

> My question is how can I create a voltage-controlled, momentary "switch to
> ground", so that I can activate a footswitch function with a GATE or TRIG
> from A-100/MAQ16-3/MCV24

Check http://www.doepfer.de/faq/gen_faq.htm#S-Trig

I built such a adaptor to control the Arpeggio trigger of my Korg
MonoPoly. Also my Moog Prodigy works fine with it.

If you don't want to solder your self, then await the A-101-9. It should
work also fine as Gate to S-Trigger converter

Florian