Actually, it is a buzz. The thing is, that if we are leveraging the instrument correctly, it is almost self sustaining. There are several ways to get there Gary has Phwoooey and I have a relaxed exhale with much reduced face tension. I'll bet the biggest difference is the visualisation.
4 hour gigs, or 2 hour performances with a full dress rehearsal the same day are not a problem - even if the going is hard and high. I am 58 and have been playing since I was 10. Most of what I do today I learned in my early 20s. The rest is just shedding..... Toooey and Koooey instead of Phwoooey