The 3M Sound On Slide system was launched in 1969 and enabled anyone to assemble and play multimedia presentations with each photo accompanied by 30 seconds of audio.

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FAQ
Q) Why are there comments from a week ago when this video has just gone live today?
A) Patrons usually have early access to videos. I'll show the first version of a video on Patreon and often the feedback I get results in a video going through further revisions to improve it. e.g. Fix audio issues, clarify points, add extra footage or cut extraneous things out. The video that goes live on youtube is the final version.