The PreSonus PS49 USB 2.0 MIDI Keyboard provides all the features you need to play music and get as creative as possible. Complete with a keybed of 49 unweighted, velocity-sensitive keys, seven assignable controllers, including pitch and modulation wheels, a volume slider, and four control knobs, plus a sustain-pedal jack, the PS 49 leaves nothing in the way of your inspiration. An Octave Shift button allows you to transpose the keyboard up to +4 or -3 octaves, and of course, you can send Program Change commands and change the MIDI Out channel.