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11. Silence throughout the Shofar blowing:
During the actual blowing of the Shofar, whether of Meyushav [i.e. before Musaf] or Meumad [i.e. during Musaf] , it is forbidden for one to [make any noise even to] spit, as one must hear the entire sound from beginning to end, even if the blow is very long. See Chapter 10 Halacha 13 for the full details of this subject!
 As explained in 590:10