ernie ball 500k stereo volume/pan pedal - featuring a 500k Pot suitable for the audio path of passive or active instrunents! Within the footplate is a switch to go between volume or pan modes, and this pedal can be used in both stereo or mono setups! Utilizing TRS stereo cables, use the B input and B output. For use as a typical pan pedal, switch the toe tap switch to the pan position and use only the A input. The pedal will pan the signal between the A and B outputs.