I have a newly aquired Yorkville XS400h. Instead of buying a 2 button switch I was curious to know if I could rewire my ABY switcher to control the tube drive and effects loop of my amp. On the front end of the amp there is a single jack for the drive, (tip), and for the effects, (ring). Anyone have a clue?

Well, you'd likely have to take all the electronics out, kiss the LED's goodbye and just hardwire the switches.

Well...I really don't forsee me needing this pedal as a ABY anymore.

Have you considered selling/trading your ABY here? I've had great luck selling and buying small part/accessory deals on TB.

Me? Buy, sell, trade...on TB? A few times....however my paid membership has expired and I can't post any ads now.