The 3M Sound On Slide system was a 35mm slide projector and audio player/recorder which enabled anyone to assemble and play multimedia presentations...back in 1969. Here’s a demo.

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Over Time - Vibe Tracks https://youtu.be/VSSswVZSgJw

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ThatSFXGuy - https://youtu.be/5M3-ZV5-QDM

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