I was listening to some of the video demos of the newly announced RealTracks. In some of the videos, there is a whole song playing in which some of the instruments are MIDI, and these MIDI instruments sound very good. Which sound module does PG Music use for MIDI tracks in its demos?

We use the Roland VSC-DxI, (which is the same as the Roland VSC-VST). This is the soft synth that is included with Band-in-a-Box.