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A somewhat distant cousin to that is the Mattel Optigan, which used waveforms printed on a transparent sheet of plastic and spun over a photocell. https://en.w
by joezydeco 3y ago
A somewhat distant cousin to that is the Mattel Optigan, which used waveforms printed on a transparent sheet of plastic and spun over a photocell.
https://en.wikipedia.org/wiki/Optigan https://en.wikipedia.org/wiki/Optigan
- epcoa 3y agoThat’s how sound movies worked for years.