This works great with Band In A Box, you can load it into BB as a vst, you can also load BBvst into RapidComposer. See more about RapidComposer and BB in this Tips n Trick forum.

Thanks to BluGenes



https://www.youtube.com/watch?v=HBJOZx_iI8Y
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ReaTrak Integrate Biab & Plugin in Reaper
Free Biab & BiabVST Chord Picker Tool