I have now created a song (with BIABs limitions on number of instruments) and exported each instrument to separate wav.

Then I changed BIABs instruments and exported once again, and then mixin' it all in Cubase - resulting in more variation/cannels/instruments than I thought was possible :-)

(no problems at all to get the two sets of export to synch perfectly)

Great fun and a good result - and I still haven't come to the point of adding real, actual, instruments yet.