M-Audio OXYGEN 61 61-Key USB MIDI Controller 9900-51394-10 61-note velocity-sensitive synth-action keyboard with USB MIDI interface Class-compliant with Windows XP and Mac OS X Compatible with free Enigma librarian/editor for storing and organizing setups All controllers fully programmable to MIDI channel Includes Ableton Live Lite 4 music production software, so you can make music right away