If it's got any kind of whammy, you're looking at tuning issues like that. Locking nut has nothing to do with it. It's a bridge with pivots and springs.Maybe I should have said...a guitar with a lockin tuning system. I mean changing the tuning on a floyd rose I heard is a nightmare and takes far too much time. I change tuning fairly often. From my understanding the AZ line comes without a floating bridge (at least the model that I am interested in).