Here's yet another way, I freeze the BB tracks without generating,
add Band-in-a-Box DAW VST FX Plugin.dll to each RealTrack/Drum
On a midi track I add MiniHost in that I load Band-in-a-Box DAW VST Plugin.dll and send it out to A virtual instrument in this case EZKeys.
You can add any FX you like after the BB VST.

In each BB Plugin I can load a MultiRiff of the same instrument, I can load different drums in the BB Plugin on the Drum track, I can load lot of different SuperMidiTracks in the BB Plugin in MiniHost.
Now I 38 tracks in BB that I can solo and choose the best combination.
If the song's chords are changed you just load that SGU into each plugin.

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