http://revach.net/article.php?id=1013

Section: Moadim   Category: Elul-Tishrei
Shela HaKadosh - The Sounds Of Crying

The Arizal said whoever does not cry during the Yomim Noraim his Neshama is not good or complete. It is brought down in the name of the Shela that someone whose hard heart does not allow tears to flow naturally should make sounds as if he is crying. Of course he must do so with a broken heart and not just making funny noises with no feeling whatsoever. His proof for this is that the pasuk says "Ki Shama Hashem Kol Bichyi" Hashem heard the sound of my cries. It may not be real cries but it should at least have the same sound. (Piskei Teshuva OC 584:2)