Okay, I went ahead and did that, and, provided I did it in that order (chord change first, then Tracks> Make all..., then Generate all), I did achieve the chord change. Problem is, there were a couple of RealTracks which didn't obey either the chord change OR even the "Make all BB tracks regular tracks" command - namely, two guitar tracks whose font color didn't change to green like all the other tracks did when I clicked that command - they instead turned black. And those are the same two tracks that subsequently failed to obey the chord change. Any reason why a couple of tracks like that would somehow be excluded from a "Make ALL tracks..." command? Thanks.