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12. The law if a congregation is unable to blow the Shofar in Musaf? [1]
The Shofar blows during the blessings in Musaf do not invalidate the blessings. Thus, even if no one is able to blow Shofar during Musaf the Chazan nevertheless recites all nine blessings in his repetition.
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[1] 593:4; Rama 593:2; Tur 593