MIDI 4x4 USB MIDI interface 4-IN,4-OUT MIDI interface(64 MIDI channels) low latency High-speed USB connection to PC or Mac MIDI in and MIDI out activity indicators for each port USB powered (no external power supply requires) No driver needed Compact size MIDI IN: MIDI input 1-4 jack MIDI OUT: MIDI output 1-4 jack USB B Type: connection between the MIDI 4x4 and the host computer ATTACHMENT: USB cable