Diki I did buy something like this on eBay and wired it to dual 1/4" jacks. After a lot of experimentation I concluded that what I really need (and the rest of the world could probably use, but doesn't know it yet) is a logic circuit that transforms a prolonged pedal depression into a brief "open" period; and also the pedal RELEASE into a similarly brief "open" period. The circuit has to continuously monitor the pedal state, and generate an "open pulse" of specified duration whenever it detects a change.

I've been assured that someone with more programming skill than I possess could easily do this with something like an Arduino and perhaps a couple of relays. I just haven't made it a priority to sit down with the head of the engineering dep't at my local community college and explain my requirements. With sufficient adjustability it would be a staple money-making accessory for keyboardists and guitarists.

Meanwhile, the system I have cobbled together appears to meet my needs. I just have to put the time in to set up the OTS's and see if that will meet my needs. Right now I'm dealing with my house reconstruction and other priorities.