The document provides an analysis of existing audio products and their use of sound effects to build atmosphere and suspense. It discusses Orson Welles' 1938 radio broadcast "War of the Worlds" and how it used subtle sounds like beeping and ticking to create a visceral experience. It also examines the BBC radio series "The Archers" and how it uses background noises to clearly set different scenes. Finally, it analyzes how Doctor Who uses the roar of a flamethrower mixed with a victim's screech to generate a disturbing atmosphere from just two sounds.