M-Audio EX-P Expression Pedal - Feel the need to express yourself fully? M-Audios EX-P expression controller pedal works with all M-Audio MIDI controllers that have an expression pedal input. 

A built-in polarity switch insures compatibility with most other brands of controllers and keyboards. Use the EX-P to control any assignable variable MIDI controller value including volume, modulation, panning, filter sweep and more. 

Durable molded construction with integral cable.