Thanks Rowuk, Yes, the lips are the major player in what we're talking about. A good read about this can be found at the university of new south wales via their acoustics department and in an article called high notes aren't hard by Drucker. I can not disagree with your claim since I now use a method best described as a squished "M". I spoke with Faddis recently and it appears he uses the same method. However, by using the arch tongue and hiss method as described in the site mentioned earlier and discussed by J. Pocius(sp) (Natural trumpet) and to shape the sound in the mouth "like whistling", the process of playing higher seems to be easier. Using myself as an example, recently I went from rolling my lips inward to play in the stratosphere to using a squished "M" to do the same thing. By conciously playing attention to the placement of my tongue and its relation to the note I'm playing(arch tongue and hiss), I've been able to change my embrochure approach(lip roll to squished "M") in the high upper register in quick order. Will tongue arch alone do the trick? doubtful. However, a balanced combination of arch tongue and hiss, Squished "M" embrochure and abdominal muscle control will do the trick. In addition, is this the only way to achieve high notes? doubtful again. Hence confusion sometimes arises. I often tell students to "think whistling" when they are suffering from too much mouthpiece pressure and it often helps.