Biab MultiRiffs an Easier Way

You can do it this way until PG do something about it:
Generate and solo the first section in track 1 to your liking then mute it with F5 where the good ends and Freeze the track.
Solo Track 2 (and Audio) Un-mute F5 at that bar, Generate the next section to your liking then mute it with F5 where the good ends and Freeze the track.
Solo Track 3 (and Audio) Un-mute F5 at that bar, Generate the next section to your liking then mute it with F5 where the good ends and Freeze the track.
Solo Track 4 (and Audio) Un-mute F5 at that bar......

Now mute the Audio Track and Drag Render the master to get your RealTrack.

If you can't use RB or don't like it REATRAK REAPER,
It gives you a way to integrate Biab to a powerful do anything DAW, It will import the chords and tracks from BBMac BBWin (BBLin ?) to the DAW REAPER 32/64 Mac Win Lin.