Punch in/out is a term used in audio and video that comes from a method of recording that was used on early multitrack recordings. In this method, a portion of the performance was recorded onto a tape that had already been recorded, usually overwriting any sound that was on the track that was used.
The soundtracks to movies are created by film composers.
"Punching does not produce the sound of a punch that we are accustomed to hearing. Leslie Shatz, who worked on "Out of the Furnace," describes it as "a wet towel slapping on a wall, sometimes with a pencil breaking in there."
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