then another E4 NOTE ON, with no NOTE OFF in between.
Right exactly, so the problem is conceptually very simple... just a missing note off. There aren't extra messages.
I'm just wondering how RealBand handles it - can you record MIDI into RealBand and attach the .SEQ file?
Presumably we should get Band-in-a-Box to handle it like RealBand does, which I'm guessing is to add a missing note off.