Very interesting waterfall (spectrogram) of a dial up modem connecting. I can even picture where all the sounds come from I remember hearing as a child from the classic dialup connection.
@freemo this inspired me to go look up some of these sounds, and i found this YT video with probably the best subtitles ever.
I didn't find it on a quick search, although https://youtu.be/vvr9AMWEU-c duplicates the original post as a side-scrolling 3D waterfall. If you happen to have time to dig up the link, I'd be happy to take a look. I'm just happy to think of some find memories. :D