Behringer foot pedal active type polarity switchable 9V battery powered mono FCV100 V2 stereo/dual

Volume/modulation pedal that works in stereo or dual mono In addition to adjusting the volume of one or two stereo instruments, it also functions as a modulation pedal by connecting it to a keyboard modulation control input. VCA control ensures smooth operation and reliability Changeable polarity switch to suit various effects units, keyboards, and MIDI controllers Powered by a 9V battery, highly durable and ideal for touring use