Charlie,
I have tried your way. Well, this is kind of trying to make BIAB behave as DAW smile trying piece together audio things, but without the visuals. I find the process perhaps useful in some ways or particular workflows, but I am afraid it will not substitute requested extra mixer tracks.

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Pipeline, interesting concept. However too, quite involved as it requires very particular setup for each project. As many users, I try to do what needs to be done in BIAB and move to DAW. If I want additional tracks / instruments, I find it easier to:
Go back to BIAB do a "Save as" project-> change out RT's(or whatever else needs to be done)->render as individual files->import to DAW project.

The drawback is that if I change something in chord or bar structure, I have to go back to original BIAB file, re-render & re-import everything, making sure that tracks fall in the same slots in DAW if they had customized FX for particular instrument. This would be a non-issue with more mixer tracks. Also, it can be very useful in other instances, like hearing re-generations side by side, freezing "wanted" sections > muting the rest of bars on same
track. For elements, short passages that as of now take up whole mixer track on the fly without renders / re-imports. Yet, having whole composition fully acceptable to any changes in the grid/bars.

Process would be much easier, more intuitive and fluid if we had more "regular" mixer tracks available smile And I do hope we will see it, as it will open many creative possibilities without technical acrobatics, leaving more time for fun.

P.S. Sorry this thread went all kinds of places. Pipeline, your "import chords from SGU seems to do the job.
Thank you.