Behringer Foot Pedal Active Type Polarity Switchable 9V Drive Possible Stereodual Mono FCV100 V2

Volume/modulation pedal that works in stereo or dual mono Performs volume adjustment for one or two stereo instruments, or functions as a modulation pedal by connecting it to a keyboard's modulation control input VCA control for smooth operation and reliability Polarity switch that can be changed to suit a variety of effects units, keyboards, and MIDI controllers Powered by 9V, durable and ideal for touring use