Dan, this is all new to me and I would like to understand more. I used to use Output Chords to a Voice Live Touch and it would harmonize with my microphone signal, and base that harmony on the BIAB chord. Past that, I know nothing.
Could you give me one example of a VSTi that is capable of playing something other than whole notes from this chord track? Just trying to understand.
Be still my heart!

What a wonderful question and opportunity for me to introduce you to a world of "BIAB - Integration with VST (intruments)". This is a big part of my music!
And yes, VSTi are capable of playing much more than single notes, they can play entire pharses including arppegios, motifs, and runs all with complex rhythms. Most importantly to us here in the forum, this can all me initiated with the "BIAB MIDI OutputChord track". As you know our Misha is a big proponent also of this topic which is why he beats the drum so loudly for VST3 support in BIAB which we currently don't have. But the good news is the "BIAB MIDI OutputChord track" can be cut and pasted into your DAW where this is all possible.
As a part of my final goodby "Not with a bang but with a wimper" tour, I will put together a short show in the near future and post it here.
Dan