Revision: sound in media

Im doing a revision from what I learn last year about sound:

Sound can be represent social groups in a range of ways:
The lenguage and accent of a character.
Use of music can tell the audience about the character.
Ambient sounds can tell about the setting of the scene.

There are different types of sound and they can be use in different ways:
Diegetic
Is a sound originating from a source in the scene, e.g: dialogue.

Non-diegetic
Is a sound added in postproduction, e.g: background music.

Sound motif
A piece of music associated with a character, place or theme, e.g: like the jaws.

Sound bridge
Is a sound use to link the end of a scene and the beginning of the next.

Dialogue
Are the words spoken by the actors.

Voiceover
Is the dialogue spoken by an unseen character over related images.

Direct address
Is when the actors speaks directly to the camera.

Sound mix
The way in which the different sounds in a scene are mixed together.

Ambient sound
Is the background noise, e.g: birds in a scene recorded in the countryside.