karena,
if you increase pressure as you increase pitch, you make it harder for your vocal folds to stretch. at your break, you are probably instinctively realising that this can't go on much longer and your folds pop open to let out the pressure. when starting above, on or, just below your break with success, have you noticed that there seems to be less pressure, or weight, than when you start at the bottom and go up through it?
mike
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