These sounds are crafter by hand, using drawn animation and then optically synthesized. Here’s more from Adam Maciaszek:
This was made back in 1930s Soviet Russia using an optical synthesizer called that variophone which takes a picture of a drawn waveform on replicates it. Sounds are drawn and paper and then dragged across the aperture to play a song. It amazes me that electronic music goes back this far and I think sounds so futuristic so I took the time to restore this little known piece There are more of these with animations if anyone is interested
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