Sounds just like me when I was strugling in the Conservatory here in Finland. After so many years of frustration and failures (talking about the embouchure here ) I began searcing for answers. (I played with the horn angling down at that time, a really nice sound but range to about a weak D over high C and EXTREAMELY bad enduranse ) To make a VERY loong story short: I found out that my embouchure functions 100 times better keeping the horn upwards.,,,and after som more time I found out that I really should keep the horn upwards all the time!! that meaning the upper register was almost in place but It was now the low register that I would have to work on to get right. After working some time with that everything was getting rapidly better and better. And now everything is GREAT!! It took more than 10 years of my life however due to my downstream teachers who just did not know anything about that and really come to think of it had me work AGAINST my best embouchure. now: Im NOT!!! saying this is the case for you guys you MUST understand that I am only pointing out what hapend to me. Thats whay I also REALLY REALLY dislikes Rowuks statement: Quote"HH, the key to high chops is not up or downtream, it is reducing pressure on the face and increasing air pressure. You will have to sacrifice some of that "beautiful" sound to optimize the high chop experience." Quote end. becouse it could VERY WELL be "the key" If you like me "where ment" to play like that. I will not discuss this further in an open forum becouse of the somewhat "closed mind attitude" that flourish on this forum. so if you lik you can PM me.