You should import the Midi file rather than open it. Opening a Midi file loads all of the file channels onto the Melody Track and the user has to manually move channels to BIAB Mixer Tracks.
Importing a Midi file separates the Midi file channels and loads them onto individual Utility Tracks.

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BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.