Subtle but satisfying: First dozen notes or so of Fur Elise but through a Gammatone filterbank. I can finally make one myself.
For me this is visually satisfying as it is one of the steps towards a cochleagram, which is a moving visual representation of how sound is _perceived_ by the human cochlea, rather than how it is seen through scientific instruments. The gammatone filter is a static visualization of how the human cochlea perceives sound.
This means that it “looks like” how you think sound _ought_ to look like because it utilizes multiple bins in the same way that human hearing does, rather than an all-purpose full spectrum transform.
Every other tool I’ve seen requires Matlab which I don’t have and while I could approximate similar results using other tools, this is a step towards my holy grail which will eventually be the ability to produce cochleagram videos.
I found other python attempts but they were all too old or broken. This one worked with Python 3.5 Windows just fine.