Quick google led me to the EHX Expression pedal, which looks pretty nice. But, its also like 90$ and i'll need at least four...i've already got enough Moog EP-2 expression pedals laying around, so was kinda wondering how easy/hard it would be to mod them...maybe to work with a 9v battery with some sort of way to 0-5v range it....maybe using that knob it already has on it? This is over my head but any input or direction appreciated. Also any experience with that EHX pedal would be great to hear, or any other maybe less expensive options.
http://www.ehx.com/products/expression- ... structions
also here is a look at what makes up the moog ep-2
http://www.teaser.fr/~amajorel/ep2/








