I always thought there was a far more eloquent way to achieve this and I am sure this is definitely achievable in BiaB:
1: Select the required bar range
2: audition the various multi-riffs in a separate, dedicated presentation display
3: choose the riff that you want
4: that riff and the meta-data that creates it are integrated into the specific track - at RealTrack level, not Audio output level
See my previous suggestion here:
BiaB ideal Multi-riff process I'm pretty sure that RealBand does this now.
And yes, there are other ways using cut and paste with Audio tracks, and I know this also. My comments here are not about arguing that it can't already be done using other methods. My comments here are about suggestions for
improving the current methods, to deliver a more user-friendly, flexible and workable solution.