Designed to be used as a fixed wah, it features a volume control, 3 selectable range modes (wacked, Jimi, and shaft), a pickup compensator (so humbuckers are ok), 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.