OK, here is your Style and Soloist Fiddle in the BIAB-VST ready to drop into Reaper. It is all looking and sounding fine.

I am not fully sure of your workflow but here is mine.

In this case, I started this song in BIAB from the Style you recommended. Next I added the soloists from the RT picker. I see the soloist is a RT audio but also has transcript midi. All sounded fine in BIAB. But if I now close BIAB and then open the .mgu file in BIAB-VST... the soloist is not present! So while still in my BIAB-VST (within Reaper) I added the soloist. Regenerated and all was now fine.

I can't really explain more than that at this time. My conclusion is: There are three or four ways to work in BIAB and transfer files to your DAW. However, not all of them will give you the results you expect. In this case the fact is the BIAB .mgu and the BIAB-VST file are not 100% compatible, which is something we already know.

Lets see if any other folks know of something different.



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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6