On a thread over at TH LeeC was talking about using 2 different embouchures. One for normal playing below G above high C, and one for playing in the extreme high range. I find this interesting. I am by no means a professional player. I am a weekend warrior. I don't play in that extreme range. I have a usable G. All the people I have studied with (Don Jacoby, Bob Ceccarini, Gordon Alt, Frank Campos...) have maintained that a trumpet player should strive to play on one embouchure throughout the range of the horn. Now some of these teachers were lead players, but I don't think they were actually people who played in that extreme range either. Anyway, how many of you professional screamers out there use 2 different embouchure settings?