@Barry: Normally I use a DAW to do these things. But for this I need BiaB as a stand-alone instrument.

@Mac: I was thinking along this line also. But this only works when you record the part with an external MIDI-instrument.

Next best thing would indeed be (as Barry sugested) to render the drums to wav, load them into the melody or solo-track and continue from there.

Ah well, another item for the wishlist then I guess.