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I've been told that the custom is to blow the shofar from the sides of one mouth, rather than like blowing a trumpet. What is the source for this custom and the reasoning behind it?
This is in the Ramo (O.C. 585:2) to blow specifically on the right side of the mouth. The Magain Avraham says this is based on the verse (Zecharia 3:1) והשטן עומד על ימינו - the Satan stands on his right side.