Thanks everyone for the answers.

Yep, when I'm doing a finished mix I take things into Reaper.

But the live duo I play in has a running spot where people can suggest any song and in the break we knock up a quick and dirty backing track in BIAB. Frustrating sometimes that when we get home and think the track is worth working on in Realband that the sound of the Realtracks isn't instantly the same when we load the song in.

Tried doing things directly in Realband at the gig but BIAB is a quicker sketchpad for this kind of exercise.

Ah well, you can't have everything!!

Thanks again to all.