Closed down my mac next day reopened the AMS and the Midi setup has disappeared again and then it crashes. Opened up the midi set up and it recognised my synth and midi worked. I have since sending you my question re installed Mac OX again then installed my M Audio driver and emagic Mt4 driver. Hi When i open up Audio Midi Setup it tells me that the Midi setup is empty then it crashes. MIDISPORT 1x1 MIDISPORT 2x2 MIDISPORT 2x4 MIDISPORT 4x4 MIDISPORT 8x8/s.ĥ meter air rifle target. Avid Pro Audio Community Mac OS X Driver for Unitor8, AMT8 and MT4 I m using LA 6.3.1 on 10.3.2 with the Emagic MIDI driver v1.5 on my DP 1.25 G4. MIDI Driver for Unitor8, AMT8 and MT4 This update improves CoreMIDI stability for the Unitor family MIDI interfaces using Mac OS X.