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Optical sound - Wikipedia

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THE OPTIGONERS, The optigan and mellotron wheezing together.

How does optical sound-on-film work? I don't get how a monochrome 2D waveform can reproduce complex polyphonic sound. - Quora

What percentage of a modern movie is filmed with on-set sound? - Quora

Are they intentionally aiming for low production values with these 'from home' versions of TV shows? It would be so easy to have better pictures, sound and lighting with very basic home

What was the impact of the introduction of long-playing records in 1948? - Quora

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Why is the sound so low quality in old movies? - Quora

Were video-audio recording cameras/apparatus available during the 1940s, or were the sounds captured separately or added during production? - Quora