Thanks Matt for the feedback. The RD700GX seems to have a default 'performance' mode (they call the modes 16CH and 16Ch+Patch) and GM2.... anyway, there is no problem with getting a multichannel output from the Roland. I don't have an RD700 option on my Opt/MIDI menu, so I have tried several things, including the Roland General MIDI. The basic problem seems the lack of drums ... there just don't seem to be any options to assign drum kits ... it's as if these are somewhere else. In general, the various Synth/Sound Card choices don't include drum kits.
So, I guess the basic unsolved problem I have is that I can get any drums associated with the Drum track (which I have assigned to Ch. 10)
Bob suggested that my computer setup might be a source of problems. I have a two month old Dell Inspirion with an AMD quad-core running 64-bit Win 7 and BiB 2010.5 so performance is up to snuff (almost 8 on the Win scale for calcs; 3.5 for video). The Roland mode is the default ... and I have been going into EDIT and tweaking some paramters, but periodically resetting.
The GM sounds do have drum kits, and these are implemented in the Roland (I have used them). I guess the question is how do I get the Drum Track to play the Roland Drums. There doesn't seem to be any entry on the GM2 menu on BiB for drums.
Crhsi