Nothing, probably. The whole thing is a fun side project for messing around with audio processing, and he decided to outsource the visualisation part (not even the logic, just the visualisation) because he knows jack shit about python and learning it for just one cosmetic part of the project doesn't make much sense.

These are -- like the analog circuits that started my journey -- toy effects that you shouldn't take seriously. The main design goal has been to learn about digital audio processing basics. Exactly like the guitar pedal was about learning about the hardware side.

Also note that the python visualizer tool has been basically written by vibe-coding. I know more about analog filters -- and that's not saying much -- than I do about python. It started out as my typical "google and do the monkey-see-monkey-do" kind of programming, but then I cut out the middle-man -- me -- and just used Google Antigravity to do the audio sample visualizer.

So this isn't some paid ad for Google, it's a busy man pursuing a hobby to learn something and taking a shortcut for a part of the hobby he's not interested in.