... take a slight inspiration after every tone. Be careful to take a full inflation only at the beginning, and afterwards to inhale less air than has been consumed in every preceding tone, or you will after a while overcrowd the lungs, and experience a sensation of being choked. This is a thing to be avoided in any case; but under present circumstances it should be remembered that the short inspirations are not taken for the purpose ... — The Mechanism of the Human Voice • Emil Behnke
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