Hey, I have a DOD FX17 Wah/Volume that I have gotten good results with, both as a wah and a volume pedal. However, I am interested to try out the Control Voltage part of the pedal. The problem is, I don't know what to get to use it. Do I get a VCO or did DOD make something to use in tandem with this pedal? If anyone knows, owns this pedal, or could help me out in a general way, it would be much appreciated. Thanks!