That... is the pro and the con of Real Band....

Every time you regen a track it changes the track. So.... if you have a track with something in it that you really, really like.... freeze it or export it.

I love that feature since quite often, the guitar and piano leads are not exactly what I want. But if I regen the track... and export each generation to my DAW, I have a number of tracks that are similar but not exact and that lets me create a smoking hot solo by editing the tracks for the best parts in each track.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.