I don't think there is a syntax for that yet.

You could edit the audio in a Utility Track. Others know more about this than I do.

As for having some but not all instruments obey rests and shots, one way I would do that is to write the song with the rests/shots and freeze only the tracks that have the ones you want to play the rests/shots. Or move those tracks to Utility Tracks. Then edit the chords to remove the rests/shots. Now the unfrozen tracks will not play the rests/shots. Some combination of this technique should get you there.


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