Floyd Jane Quote, 4/14/21:
<< You can then import that into you other BIAB file as an audio track.
I believe that if you name it properly (I do not know what that name IS, but others can probably tell you - Charlie Fogle or Noel Adams would likely know), and put it in the same folder as you full SGU, it will automatically load it to the Bass track... >>
Floyd is correct and he's referring to Artist Performance Files. (PG Music refers to them as Performance Files in the Mixer settings. One can see that this is a very versatile and powerful tool from the description below.
PG Music, Andrew Quote 12/4/13 from the UserTracks Forum:
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7. Artist Performance Files.
These are audio files, that you put on a track, that can also have the MIDI transcription of it. People hear the audio, and see the MIDI in notation/guitar tab etc. For example, if you are a great bluegrass fiddle player, you could put your songs in this format. People can listen to your real playing, see the notes on screen, slow them down etc. - all inside Band-in-a-Box where they can do other things like solo/mute other tracks, mix them etc. >>