Cool.
Mine is PRO 2. It goes on sale from time to time. That is how I got it.

There was an update yesterday. Peter Gannon said that preserving keyswitch issue I spoke about will be fixed in the next patch. I am very optimistic about that. Also perfect timing as they rolled out VST3 support.

P.S. there are a few other string VST instruments that will do similar using chord track in BIAB.
Perhaps a going out of business Kirk Hunter is not a bad idea if you get what you want cheap.