Behringer FCV100 V2 Active Foot Pedal, Polarity Switchable, 9V Battery Powered, Stereo/Dual Mono

Stereo or dual-mono volume/modulation pedal Stereo or dual-mono volume/modulation pedal Adjusts the volume of one or two stereo instruments, or functions as a modulation pedal by connecting it to the keyboard's modulation control input VCA control ensures smooth operation and reliability Changeable polarity switch to suit various effect units, keyboards, and MIDI controllers Powered by a 9V battery, it's durable and ideal for touring