8x8 USB Bus-Powered MIDI interface. Built from the same technology found in MOTU's flagship MIDI Timepiece, the MIDI Express 128 is a professional MIDI interface that provides plug-and-play connectivity to any USB-equipped Mac or Windows computer. The Express 128 provides 8 MIDI IN, 9 MIDI OUT, 128 MIDI channels and compatibility with all Macintosh and Windows software. The MIDI Express 128 takes full advantage of USB, giving you high-speed MIDI throughput, sub-millisecond timing accuracy, support for "hot-swapping" and plug-and-play expansion. Need to connect another sound module or synth? No problem. Just add another MOTU USB MIDI interface via any available USB port. And the Express 128 is powered by USB - no wall wart or AC plug. No other MIDI interface offers this much value and performance at such an affordable price.