That's indeed the number 1 problem with the visualizer. ACF waves can greatly vary in magnitude and if there is a loud bass wave that's 1000x bigger than small

That's indeed the number 1 problem with the visualizer. ACF waves can greatly vary in magnitude and if there is a loud bass wave that's 1000x bigger than small wavelets from background music, those wavelets will be present, but barely visible. That's also why classical or otherwise "peaceful" music looks so good: all waves have about the same height. I've in fact tried implementing the equal loudness contour - try adding ?acf.aweight=1 to the URL. However the result is mediocre. I've also tried applying a few bandpass filters for low, mid and high frequency ranges, rendering them separately with different colors and then mixing images together. The result is, again, medicore. I've been entertaining the idea that ACF waves are ought to be rendered like ocean waves: via light reflections.