1) The media on which they were recorded was physically cut and spliced together. This was most common with film, where the term cut is still used.
2) “Filters” were applied to the various input streams as they were were recorded. This could be as simple as placing a coloured sheet over a camera to alter the colour palette in the scene, or applying an electromagnetic filter to an audio signal to do anything from simply adjusting the volumes to more complex processes to introduce or remove noise. Things like the amplifiers and distortion pedals used with electric guitars are doing fundamentally the same things.
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