I just tried it with the VST2 and I get no sound, this is the same problem when it's loaded in Biab I get no sound but if I put it in Element I get sound.
You load Element in Reason then just drag the the VST3 into Element,
hook the audio in/out and midi in/out up then enable the EXT in the top left.
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ReaTrak Biab & Plugin in Reaper
Free Biab Chord Picker Tool