I used to be able to play crazy high notes by changing my embouchure (an extreme pivot), but I couldn't play anything else with that setup. After a number of years messing with that (and playing lead in a big band), I just about destroyed my tone in the mid and lower register. I gradually got a nice tone back, but don't have much range any more. On a good day I can play an E or F above high C when I'm fresh, but most of the time, a high D is my secure range. In most of the playing situations I find myself in, that's enough. I've worked for the past few years to eliminate most all pivoting as I ascend or descend (using Schlossberg), and it's a much smoother way to play.