Watch Your A's and B's

Because they require so few fingers, are so easy to play, and so open in tone quality, they thus can sound rough and go sharp very easily. Keep the sound "dark" by not blowing to the fullest extent, using slow and "warm" air. They are often the hardest when you're descending onto them in a passage, as coming from a higher place means your air will be too fast for them. Thus for example, we'll need to pay fine and nuanced attention to the opening of a G major scale (G-A-B-C-D), a seemingly "easy" scale on the traverso.