I'm about to tear my hair out on this. I killed the entire existing melody track. I created a clean new midi file with no tempo indications in it whatsoever. I then imported this file into the BIAB melody track. It played very poorly, tempo-wise. I quantized the entire melody track to 100% at 32nd note accuracy. The tempo improved. I froze the entire arrangement -- all parts -- I hit PLAY, and I'm back to square one. The tempo sucks big-time.