I second the schematic call for the A-E switch units. I have one, sold by Toysmith, and have been struggling with it. So far all I've done is add an input and start the feedback mods.

I've poked and proded on it for a while and am having problems getting any pitch shift anywhere. Oddly enough, its similar to the problem Ryan has... I can touch it and it goes up. A resistor however has no effect.