rowuk; Here's your words from "upper register problem" I never said you advocated the technique, I said we discussed it. ---------- Just blowing does not relate to playing the trumpet. The lips open and close like valves, completely stopping the air (check this link: IWK Brass Research ) The teeth are also in the way, so that even if the arched tongue did something, it would be cancelled. Proper playing finds equilibrium between the backpressure of the horn/mouthpiece and our airpressure blowing. If we blow too hard, the lips would collapse into the mouthpiece cup. The only argument that makes sense to me is turbulence in the mouth. __________________ Whenever I feel blue, I start breathing again. This discussion comes from "upper register problem and I suggested that maybe the Poster got the idea from the discussion about Arch Tongue and Hiss (which came from me) and making the aperture smaller (which came from you) and thought you were the one who recommended arch tongue and hiss. bernoulli was also mentioned in this thread.