<< In BIAB 2019 for Mac, you can't record your user track in BIAB itself; only the Windows version allows this. >>

Your 2019 Mac BIAB version should be able to record UserTracks. Mac BIAB has had audio recording capability since version 2015. I've attached a screen shot of the Mac 2019 Toolbar with the Record Audio Icon.

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2019 Mac Tool Bar with Record Audio Icon.

BIAB Ultra Pak+ 2024:RB 2024, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.