Akai Professional MPD 24 USB/Midi MPC Pad Controller 16 velocity and pressure-sensitive, genuine MPC pads 6 assignable Faders and 8 assignable 360 knobs for transmitting MIDI Control Change data REW , FF, STOP PLAY and REC buttons that transmit MMC (MIDI Machine Control) messages to DAW/Sequencing applications MIDI and/or USB operation, USB buss powered (or powered via optional AC adaptor) Includes a customized version of Fxpansion's BFD Lite and Editor Librarian software (Mac and PC )