Right, you have to go back and forth.

Alter the song so it is substyle A at bar 9 and wherever you want substyle A for drums. Generate, and freeze the drum track. Then alter the song back to add the B substyle and your frozen drums still play A. Likewise, make the whole song substyle B, freeze the string part, alter the song back and use F5 at a bar to mute the strings where desired. If not muted, they will play throughout because they were frozen in the B substyle (except for where you mute them).

Experiment.



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