Thanks for the quick response.

However, I'm not sure what you mean. All tracks in both styles are real tracks; and the issue isn't the guitar track, per se. The drums change but piano and bass disappear along with the guitar. The help says you can't use a real track and a midi track on the same track (not sure why that is so) but that isn't what I'm doing.

As for trying different styles, that's unacceptable. Apart from the prohibition of combining of real and midi, why would one combination of real tracks work and not another?

Are there any other restrictions on changing styles mid-song?