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If you have the Windows version of BiaB this might be more easily undertaken using RealBand.

A Type 0 MIDI file has all of the channels on one single track. RealBand can separate those channels onto individual tracks, then save the file as a MIDI Type 1 where each channel has its own track.

In RealBand, check the Help section under "Edit - MIDI - Extract Channels to Tracks"


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