Rachael, Martin, thanks for the help. I'm sorry if I'm being dense, but I still don't follow. When I do F5 the window that comes up says "Edit Settings for Bar" whatever bar number I'm on. I see the window that says "Settings apply to Chorus #" and I can select whatever chorus number I want. However, I would need to repeat that setting for each bar, by first selecting a bar from 1 through (say) 32, then selecting whether to mute or unmute the melody for that bar for each of the choruses.

I guess that would work, but what I was hoping to do is to first select the chorus, then mute or unmute the melody for all 32 bars for that selected chorus. That way I could do it in 3 steps instead of 32 steps. Am I missing something?