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The M-Audio Keystation 61es USB MIDI Controller is a velocity sensitive MIDI controller with 61 semi-weighted keys. It features a pitch bend wheel, an assignable modulation wheel and an assignable volume slider. The Keystation 61es is USB bus powered and has a five-pin MIDI output for controlling external MIDI hardware. It can be used as a USB MIDI keyboard and a MIDI interface in studios and classrooms.