M-Audio"s Axiom 25 Advanced 25-Key Semi-Weighted USB MIDI Controller puts great drum programming and performance at your fingertips. This advanced 25-key USB mobile MIDI controller features both semi-weighted action and assignable aftertouch. 8 rubberized trigger pads and rotary encoder knobs let you get your hands on synth parameters, virtual mixer controls and more. Six transport controls can also assign to control other MIDI parameters. You get 20 memory locations for on-board storage, and the backlit LCD screen makes programming easy and intutive. Virtually everything is freely MIDI-assignable, letting you get the most out of your MIDI software and hardware. Octave and transpose up/down Preset, program change, MIDI channel +/- buttons 20 non-volatile memory locations Memory dump via Sys Ex Controller Mute function mutes output to avoid parameter jumps Snapshot function transmits all controller settings Backlit LCD display On/off rocker switch Built-in USB MIDI interface with standard MIDI in/out jacks Powered by USB or optional power supply Compatible with free Enigma librarian/editor for storing and organizing setups Includes Ableton Live Lite 4 music production software PC Requirements - Pentium 3 800 MHz or higher, 256MB RAM, DirectX9.0b or higher, Windows XP Service Pack 2 or higher Mac Requirements - G3 800MHz/G4 733MHz or higher, 256MB RAM, Mac OS X 10.3.9 or higher Size - 18.8 x 11.2 x 2.6 (47.8 x 28.5 x 6.6 cm) Weight - 5.5 lbs. (2.5 Kg)