A friend has been working on this great shader to render part of the second stage from Gimmick! and I've been tasked with generating the music. Since I don't know a thing about shaders, and we had a serious time constraint to think about, I whipped up a really crappy C preprocessor to parse a stream format of music commands and parameters to generate the ugly summing functions seen here.
The final result can be seen here. It has historically worked poorly in Chrome, and will require working WebGL. I'd open this in another process in case you have anything important in other tabs or windows of your browser, lest it should crash.
https://www.shadertoy.com/view/4llSRf
If it does compile for you, try uncommenting line 19 to let the neat animated waves come in.
The final result can be seen here. It has historically worked poorly in Chrome, and will require working WebGL. I'd open this in another process in case you have anything important in other tabs or windows of your browser, lest it should crash.
https://www.shadertoy.com/view/4llSRf
If it does compile for you, try uncommenting line 19 to let the neat animated waves come in.