Thanks Larry K - I'm making progress. I downloaded the asio4all. Now samples play in the synth panel config DST window (just like in stand-alone mode) but still nothing plays in RB. I also got the 32-bit DST Komtakt synth to play, but only in the DST Window, not in RB.
In both cases the green volume indicator on the track moves but the master volume indicators show nothing.
This is a head scratcher ??
A new problem is now I can't have BIAB and RB open at the same time. They don't share the asio4all.