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?
Thanks for posting this question. It and its answer are going to go very well in Days of Awe - Mi Yodeya?.– Isaac Moses ♦Jul 20, 2015 at 4:46
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.
1What if the baal tokea is a lefty? Any difference? Sep 22, 2014 at 19:55
1@BruceJames, yes, the Magain Avraham there says that it should be done on the side opposite where the Teffilin of the hand are worn, so a lefty would reverse sides if they reverse their Teffilin.– YishaiSep 22, 2014 at 19:59