All I could add to that is that I have used ViLabs Ravenscroft Piano (32gigs) and 64bit version, with no issues, along with a couple of instruments in Sampletank 3 (also 64bit). Maybe I was lucky, but I didn't notice anything crashing - although maybe those two are not really pushing the limits..?

Don't get me wrong, I'd LOVE BIAB to be native 64bit smile , all I'm saying is it seems to work okay with J-bridge for me.