richard,
it sounds like you are trying to reduce the sound in your decrescendo. remember, piano has to reach the cheap seats too. piano means soft not quiet. if you think of a decrescendo as a change in quality, rather than a change in size, you may find that you are no longer going to strangle the sound.
if you think of shutting the glottis to stop the sound, i think that would be more effortful than opening it all the way (the folds have to be touching or near touching in order to make a sound). and by the way, what do you stop the breath with? the only way i can think of is closing the glottis.
mike
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