Behringer Cmd Mm1 4-Channel Mixer-Based MIDI Module with Built-in 4-Port Powered USB Hub 4-channel mixer style DJ MIDI controller Full-size 60mm channel faders and 45mm crossfader for a professional fee High quality 4-port powered multi-TT USB hub for connecting other controllers MIDI-reactive buttons and LED peak metering to keep your eyes from the computer screen Class-compliant MIDI protocol enables plug-and-play with any MIDI software