I don't know Reaper so I can't help with your question. Whenever someone posts that something used to work and now it doesn't, it leads to the follow-up question: what changed?

Have you updated Windows, Reaper, or BIAB?

Have you contacted PG Music Support to ask this? Have you posted on a Reaper user forum, assuming there is one?

Could you please supply some detail: what version of BIAB, what version of Windows, and anything relevant about Reaper.

I'm assuming Reaper must handle MIDI. If it doesn't, then your speculation makes sense. It would be easy to test that by trying an all Real-Tracks BIAB song.

Good luck!


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.