In a film or video’s final stage, trained sound designers and technicians work on the audio tracks to create the sound mix. There are several steps in the process of creating a sound mix. A sound designer will add sound effects or supervise the re-recording of dialogue (known as ADR). A musical composer will write and create a score for various scenes. Finally, a sound mixer will take all the audio tracks of the project and adjust the levels and tone to create a dynamic, seamless and rich sounding sound mix.