cavefish wrote:
fatmac wrote:
I, also, would suggest it is your embouchure, it takes time for your lip muscles to toughen up.
well i got great flutes, so it must be me

as people chime in they might have the same experiance as to confirm
I only experienced this as a beginner, and as time went on and my embouchure refined, this effect went away. I suggest it is fatigue from effort, wherein toughening is indeed required for greater endurance so long as the effortful paradigm is pursued. But there is a way that is utterly relaxed and effortless, and I don't know how to describe it in detail, except to say that all one's efforts have nothing directly to do with it except perhaps as negative preparation, if that makes any sense. For me it came about on its own, and only after years of effortful embouchure; then one day all that forcing the embouchure was sloughed off, and the effortless embouchure took over and produced the best tone, volume and control I had ever previously had - not to mention ease in consistency and staying power - and there was no question of ever going back. I suspect that, like me, most people will have to go through the effortful way first in order to get there. How much time it takes will depend on the individual.
So make effort by all means, but keep your eyes on the horizon: there are breakthroughs to be had.
Sedi wrote:
Apart from "user error" the only other thing that comes to mind would be moisture collecting at the tuning slide, which could dampen the sound, or so I have read. You could try if it still occurs when the slide is all the way in. Which model do you have?
In my personal experience moisture is more of an issue with whistles than with flutes, but that's just me.