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in film, the member of the camera crew in charge of sound production.
The sound man helps develop the director’s script and select the actors (according to the quality of their voices and their diction). He prepares the sound arrangement; conducts test recordings; mixes synchronized recordings; records the sound track, music, and sound effects; and dubs the film.
In the radio, television, and record industry, the sound man records, reproduces, and edits the magnetic tapes made under the direction of the producer, makes recording copies, and repairs old recordings.