Spent some time seeing if the BIAB-VST would follow a Tempo map in Reaper. Picture tell the setup. You can see where I Ritardendo a full bar section to drap out the part. Then return to original tempo. Works and sound great in Reaper, but no so much with the BIAB-VST. My conclusion is it does not follow the song tempo map when played in Sync mode.

However if I copy and bring the midi / RTs over I suspect it will work fine.

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).