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Do you have any blog posts on how you make these visualisations? Really great! Any libraries you use?

The mono implementation is what I expected but the stereo implementation was quite a surprise to me! I had made the mistake of connecting my computer audio to the PHONO on my amplifier. It didn't sound right because of the RIAA curve correction. :)

Well, TIL! I'd always thought that the stylus moved up and down to represent the changes in waveform, not left and right!