I heard a flautist the other day going on about adjusting the crown of her flute. At least I think that is what she was talking about. She continues to have problems with the intonation of the upper octaves especially at high volume. Seems to me this would be better addressed by embouchure adjustments, but not being a very savvy flautist I held my tongue. What does adjusting the stopper or crown of a flute do for a player?