This sturdy, ultra-compact unit provides two different modes of operation: program change and control change, plus allows to have access to tuner and tap delay functions of the bass multiamp, and to add an optional expression pedal. The Bass Multiamp midi pedalboard runs on a 9vdc phantom power from the multiamp via midi cable, as well as external power supply. Thanks to its very small size you can keep it in your multiamp bag or in your instrument bag. Technical Specs Switches: 8 Inputs: Exp Pedal Usb (For Service/Maintenance) Output: Midi Out (5 Pins) Modes: Program Change (Normal / Incremental / Bank) Control Change Other Features: Multiamp’S Tuner Access Multiamp’S Tap Tempo Power Requirement: 9V Dc In - 100Ma - Power Supply (Not Included) Or Phantom Power Via Midi Cable (Included) Dimensions: 4.41" / 11.2Cm | 2.05" / 5.2Cm | 8.67" / 22Cm Weight: 1.23 Lbs / 560 Gr