Thanks Floyd -
I used Real Tracks for the Drums, Bass, and some of the held guitar parts.
The way I work is; I design the arrangement of the song in BIAB and try to get it as close to my vision as possible, within the limits of the software.
I then export the song as WAV files with Normalise and a flat mix of 110 volume and no panning or effects.
I then import the wavs into REASON or CUBASE (mostly Reason) and then I play real instruments; guitars, bass, keyboards, etc removing some real tracks, editing others.
I then add vocals, and do a final mix.