I would vote for a future improvement to include transposing while keeping the frozen tracks. I've wanted this before from time to time, and the more people use multi-riff the more there will be complex customized frozen tracks that would be a pain to reconstruct when the program might be able to do it automatically. It seems to me that the program must actually know all the information it needs to do this, so perhaps it would not be too hard to implement. However, if the key change is too great, perhaps some of the notes or chords would be out of range in the new key, and a warning notice might be needed to make this clear that it is impossible. Still I like the idea.

Before multi-riff, I was in the habit of making many copies of the stems of a song, each regenerated, and then cut and pasted a single comp in the DAW, which I know a lot of people did. In that case, transposing wasn't an issue. But with the introduction of multi-riff, which is a real time saver, this feature-request seems like a no-brainer.