The document discusses various audio editing techniques used in filmmaking to enhance scenes, including fading clips in and out to indicate time passing, adding a resonant filter to a phone call to make it sound distorted as if being listened to, having heartbeat sounds fade in to create subtle tension, adding deep bass to emphasize an important event, using loud boom sounds to make a title bold and powerful, and including sounds of police sirens and ticking clocks to portray a character as a law officer and indicate time is a factor.