The step to select all channels in incorrect to load the midi channels onto individual BIAB tracks although they can be separated using the Sequencer.

But, from the import page that open, change the each channel from Melody to Utility Tracks like displayed on the second screenshot and each channel can be loaded to its own BIAB Mixer channel.

However, here's an easier method:

When a Midi file is dragged and dropped onto the Main Chord Sheet, it will automatically default to importing the individual midi channels onto individual Utility Tracks.

I prefer the drag/drop method in nearly all occasions I import a midi file.

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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.