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11. Silence throughout the Shofar blowing: [1]
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.[2] See Chapter 10 Halacha 13 for the full details of this subject!
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[1] 592:8
[2] As explained in 590:10