The ROM update for MU128 which is compatible with General MIDI Level 2. The update is working only through MIDI interface. Take note that not all USB MIDI interfaces working correctly with this upgrade. I tried 3 times to upgrade via E-MU 2x2 USB MIDI interface, and all tries was finished with fail on final checksum. Correct uprgade was only when i used Creative Audigy 2 internal MIDI interface. I also confirm that Fast Track Ultra MIDI port works perfectly with this update.