Sierra sets out to test her blowing pressure with our two most standard mouthpieces. She achieves some respectable pressures even though there is considerable audible leakage. We try a third mouthpiece, and then she proceeds to do a couple of hours of experiments that require considerable blowing effort. She then tries the pressure test once more, and demonstrates much better mastery of the mouthpieces.

Sierra sets out to test her blowing pressure with our two most standard mouthpieces. She achieves some respectable pressures even though there is considerable audible leakage. We try a third mouthpiece, and then she proceeds to do a couple of hours of experiments that require considerable blowing effort. She then tries the pressure test once more, and demonstrates much better mastery of the mouthpieces.