etch

Hi all-- I just picked up a pds 3500 and am trying to figure out all of its capabilities for use with my midi/synth/effects setup. I'm primarily interested in using it for program changes/effect setups, but i want to know all its ins and outs. There is a cv input (up to +5v) on the pds3500 that can be assigned to a CC message (expression, mod wheel, pitch bend, etc.). The manual says it's for use with the FX-17 wah/volume pedal. Does anyone have any experience with other cv out pedals/synthesizers/etc. with the PDS 3500?