With the Voodoo Lab Control Switcher MIDI Amp Function Controller you can switch channels on multiple amps and easily automate any non-MIDI functions! Using a Commander or Ground Control Pro switch, Voodoo Lab’s Control Switcher gives you instant MIDI programmability for controlling all foot switchable amp functions including channel switching, reverb, boost, EQ, loop and more. The Control Switcher Features 4 completely isolated relays with front panel instant access buttons, separate 1/4 inch mono outputs and a multi-DIN connector. Runs off a standard 9V power supply and is compact enough to mount behind an amp, inside a rack, or on a pedalboard.