I know they can add audio in post by Foley artists, but how do they keep sounds of equipment, people, or other background noise that isn’t wanted out of the movie?
I’m especially curious about older movies that were made before the rise of digital audio.
If you want to see/hear an amazing example of what they could do with analog technology, watch the ‘Telluride’ version of Touch of Evil. The sound in the opening scene is fantastic.
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