It is sound that the characters can hear as well as the audience, and usually implies a reaction from the character. Also called "literal sound" or "actual sound":
- Voices of characters;
- Sounds made by objects in the story, e.g. heart beats of a person
- Source music, represented as coming from instruments in the story space.
- Basic sound effects, e.g. dog barking, car passing; as it is in the scene
- Music coming from reproduction devices such as record players, radios, tape players etc.