in the options - preferences - Realtracks, you need to tell BIAB where the RTs are - see picture below. Then you need to do the same for the realdrums.

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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 ).