Musitronics Mu-Tron C-200 Volume Wah Soundgas Type 636P And here is the demo

And here is the demo with another one we had recently shredding the beat from a 70s Teisco R-3A Rhythmer drum machine:

It took us ages to track our first one down for the studio and we still don't see them very often

but the Elka features rotary volume pots that allow swift creation of varied rhythms on the fly simply by dialling in/out the individual drum sounds

Everything looks to be completely original

Musitronics Mu-Tron C-200 Volume Wah Soundgas Type 636P And here is the demoExcellent 1970s optical wah volume pedal. Serious heavy duty build. Ships serviced, in full working order. Modded with extra bypass switch and 220 240v (can be returned to 110v)