Peter, thanks so much for your video. Your explanation makes more clear that paradox of the lip corners appearing to pull back when they are actually moving inwards. I really wish there was a way to know 100% what is going on inside the mouthpiece when we play. Maybe that would help me figure out some things. I’m thinking of making a new video to show what I normally do and how it sounds on the leadpipe. I don’t buzz when I play but I think my lip setting is such where I can buzz on the mouthpiece and it feels comfortable and does not sound pinched. But I must pinch at some point which would account for my range and endurance limitations.