Hi Tom, welcome to forum,
I love to experiment blending various drum tracks in RealBand as it is not possible in BiaB. For example, latin percussion RealDrums does work fantastic with some RD rock pop drums for latin rock ensembles. After create the initial arrange in BiaB, I exported the song to RB and mounted the multi drums sets for my song
Latin Cowboy. Since RB and BiaB share song making features, I can do further adjustments in my song chords, edit and mix MIDI, audio and use multi intruments VSTi setups. RealBand is the BiaB post-production 'lab' when you need to go beyond the basic song production. Even you don't need BiaB for use RB, since it is a complete stand-alone application for your audio and musical needs.
Carlos
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Latin Cowboy.