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This is the only reference I have to it https://imgur.com/7ZoTLX7

It's pretty common to use Audacity as a (very crappy) oscilloscope to capture analog signals via a sound card, is that maybe what you're thinking?

There's some visualizing memory stuff in this bluray drive reversing

It’s fun loading images into Audacity. The audio effects look surprisingly like they sound.

cool! good to know.

Maybe Spectrograms?

i.e. Aphex Twin's Equation