From Blackstar: The Live Logic MIDI footcontroller gives you quick and easy performance control of any MIDI hardware or software platforms and plugins. MIDI over USB, assignable functions and two expression pedal inputs make it the perfect MIDI control solution and it can also be used as your USB MIDI interface. Power it anywhere via USB, 9V battery or power supply. Compact and versatile 6-button MIDI controller. MIDI over USB for use with DAWs, plugins and live sequencer/sampling software like Ableton LiveTM. Can be used as your USB MIDI interface. 2 x expression pedal inputs for continuous control of MIDI parameters. Controls Program Change, Control change, Note and Clock messages. Customisable MIDI messages via free Mac/PC software. Battery, 9V DC or USB bus powered for use anywhere. Stage visible LED display. Rugged metal housing.