The Engl Custom Z-10 Footswitch is designed for Engl amps that are equipped with the Engl MIDI Interface Port. It enables you to select channels directly and activate diverse auxiliary functions. For amps that feature more than 2 switchable auxiliary features, you can assign the desired function to the 2 switches located on the Z-10 via coding switches. The defaults or factory presets for the coding switches are the Master A/B and Reverb switching functions. Power is supplied to the footswitch via the special connector cable.