On Fri, 21 Jan 2000, Fraser, Colin J wrote: Another note found on MIDI.ORG, "Realtime message ONLY may be interleaved with System Exclusive.". So that's it. So when you write code you should allow rt messages go through SYSEX, but not interleave with other MIDI messages. MTC messages even though "realtime" belong to sysex category. =Mikko