15 years ago Robin Trower called Michael Fuller and said he was doing some gigs with Jack Bruce and asked "Would it be possible to have a wah wah in a regular box so that one could get that "fixed wah" sound by clicking on the pedal?" He's got the first one, Fuller has the the other one.Recently Joe Satriani asked Fuller for one, so he revisited the circuit adding a Volume Control, 3 selectable Range Modes (Wacked, Jimi, and Shaft) , a Pickup Compensator mini knob (humbucker guys rejoice!), and JFET input and output buffers. These buffers completely isolate the circuit from outside influence and are only in-play when the pedal is ON, giving it a much broader range of wah effect, interfacing with all types of PU's better, and working with any amp whether it be hi-gain or clean. Turns a Fender into a Vox, and allows infinite sustain with little or no Distortion.