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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"


BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.