The micro express is a mini version of the MIDI Express XT. It has many of the same features as the Express XT - except that it is smaller and even more affordable. The micro express is a half-rack unit with 4 inputs and 6 outputs. The micro express takes full advantage of USB, giving you increased MIDI throughput, better 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 a standard USB hub.