This 20-note MIDI pedalboard was especially designed for the traveling musician or for use in setups where space is limited. This rugged pedalboard features two MIDI IN jacks and a MIDI OUT jack. An optional EXP-50 or EXP-100f expression pedal can be easily attached without any tools by using the knob bolts provided. It also contains a built-in sound source. This allows the player to use it as a stand-alone bass instrument even without a MIDI sound source. Built-in sounds include five types including Electric Organ and Fingered Bass, Pipe Organ, Synthesizer-Bass, E-bass and Double-bass.