You would have to use the Rehearsal letters to control the playback differences, but you can use Text (use the up arrows to raise them) to indicate otherwise (Verse, chorus or whatever). I have not tried, but you might be able to use Rehearsal B and not have any A used at all if that is how you want it controlled.
EDIT: The reply just above was from years ago when it was first created. Doo Doo Cats is not a dual style so does not respond to Rehearsal letters.