It seems to work fine on BB tracks in Reaper using the BB track injector from the Biab forum, giving full control of what you need and infinitely variable.
You can use melodyne and still be able to change any section/slice of track any time as well as lengthen/shorten any riff as it's using the source files, this gives way more control than just getting what RB gives.
This will put the tracks in Reaper quicker than can be generated up in RealBand.
Now if RealBand could work that way it would be a different story.