How was audio level balance of older movies controlled before tape?
Movies like Gone With The Wind, The Wizard Of Oz, all those MGM musicals - they often had fairly involved soundtracks - on-set spoken dialogue and other sounds, big bands and orchestral scores, sound effects. My assumption is when tape arrived you could balance it all in a studio and sync it up with the film to be transferred to the optical soundtrack.
How was the audio mixed and the levels kept balanced before they had tape?
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