I feel this is a very important and relavent quote; it can be seen in every film when music or sound effects are used. Have you ever watched a scary film on mute?not quite the same effect! Yes a film has to have a good story line to make it scary in the first place, but without the tention buliding music and the dead silent pauses we would have no idea when something scary is going to happen. Music or sound effects create an emotion within you and triger a feeling which you relate with happiness, fear, speed, slowness etc. Sound effects are pre-recorded sound cues that help us tell a story. Not only does it create this feel but sound is an expectation. The reason for this is because we are used to constantly hearing noises around us, where ever we are. Even in a quiet room there is still some form of sound whether it be distant traffic, radiator, air conditioning or the fridge. We always expect to hear something and if a film doesnt have any sound it will seem lifeless. Most modern films will have a different sound for every scene and movement.
Below is a link to Michael Geisler's own page, which shows how he feels, decided and designes the sound effects used.
http://www.awn.com/mag/issue4.01/4.01pages/geislersound.php3
Below is a short clip of a video with and without sound effects.
