I wrote this JS thing 9 years ago and it still runs in the browser https://ericoporto.github.io/bgmJs/ https://ericoporto.github.io/bgmJs/ Much simpler implem

I wrote this JS thing 9 years ago and it still runs in the browser https://ericoporto.github.io/bgmJs/ https://ericoporto.github.io/bgmJs/ Much simpler implementation, you can read the JS code that was manually written. There is a link to the repository in the page.