The harmony accompaniment seems to be controlled by the chords, but I can’t figure out how to turn on or off the drums by measure.
@etotman you can create a new band for that measure by selecting the measure region above the staff and clicking “add band change”. You can then mute drums playback in this measure by clicking on the mute button to the left of the volume slider in the band GUI.
I see it now! It is partially hidden, and I have no way to un-hide it, but at least I can use it. Thanks!