Yes, BIAB opens a midi file saved from RB onto separate tracks when the RB file used midi on separate tracks. A midi file with all midi channels on a single track opens in BIAB on a single track and in my test, didn't analyze the chords.

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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.