Thanks to a comment on the previous post on Toni Basil's video, I've been able to eliminate the Grass Valley video switcher of 1969—too primitive. What we're looking for is a computer platform that would be able to blend colors over time. Pretty much everything else can be explained by simple color separation overlay. It seems clear that the technology used already includes SMPTE time codes.
and my guess, Fairlight CVI, is incorrect - it didn't come out till a few years after these videos were made.
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