M-AUDIO AXIOM 49 49-key velocity-sensitive semi-weighted action keyboard with assignable aftertouch 8 MIDI-assignable trigger pads 8 MIDI-assignable rotary encoder knobs 9 MIDI-assignable sliders 15 assignable buttons, including 6 transport buttons assignable pitch bend and modulation wheels octave up/down; transpose up/down 4 independent configurable keyboard zones 15 buttons and backlit LCD screen for total front-panel programming sustain and expression pedal jacks built-in USB MIDI interface including standard MIDI In and Out jacks powered via USB or optional power supply class-compliant with Windows XP and Mac OS X 20 non-volatile memory locations memory dump via Sys Ex compatible with free Enigma librarian/editor for storing and organizing setups all controllers fully programmable to MIDI controller number and channel Controller Mute function mutes controller output to avoid parameter jumps Snapshot function transmits all current controller settings on/off rocker switch weighs only 10 lbs. includes Ableton Live Lite 4 music production software so you can make music right away