>> because surely you're not disputing the oscilloscope part of it

Yes, I'm disputing the oscilloscope part of it. An oscilloscope does not plot pitch vs time. You could devise circuitry to do something like that.

Having plugged audio directly into an oscilloscope, I can say that's not how it works. Well, not all of it. The into seemed more like it might actually be left/right audio into a scope, but the other parts did not.

> Having plugged audio directly into an oscilloscope

i'd suggest you do it again before making baseless accusations. they provide you the ability to download the audio. they even provide a bit of software to drive lasers with the data.

as a follow up to my own post. I couldn't remember the video, but the YT algo found it for me[0]. Smarter Every Day did a video with the same people from TFA that shows exactly how they do these. I can't find any better evidence to show your "thoughts" being totally baseless.

I hate double replying, but I was busy

[0]https://www.youtube.com/watch?v=4gibcRfp4zA

> An oscilloscope does not plot pitch vs time.

You're right, it doesn't, and that's not what's happening here. It uses the X/Y deflection mode of the oscilloscope, plotting left channel vs right channel.

If you don't believe it, play it on an oscilloscope yourself. (I have!)