Scott,
The FS300 was orriginally designed to be used with the Digitech Vocalist and uses a single, 1/4-inch, stereo connection at both ends of the cable. However, after looking at the schematic diagram, I was able to constuct a custom cable that has a single 1/4-inch stereo cable at one end, and splits into three 1/4-inch mono cables at the other end. It took a while to figure out the combinations, becuase within the switch box is a series of three momentary switches and two blocking diodes that make all this possible. As for use with the Vocalist VR, the switch on the right turns the harmony on/off, the center switch is reverb on/off, and the left switch is a program selector. I've built several small, multi-switch boxes for some local musicians and there's really nothing to it.

Cheers,

Gary
_________________________
PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)