Hauptwerk 7 piston registration.
sorry if this is not the correct place to post this question.
I have Hauptwerk 7 and a 4 manual organ. Everything is was working fine but I wanted to put some new registrations on my keyboard pistons. I can adjust the Solo, Swell and choir but the Great will not let me adjust them. Has anyone had the same problem and if so any suggestions on how to fix it.