Thanks for this! I've been looking for something like this for a while now. I've made a couple ambient music generators that utilize webaudio and have been looking for something like this to generate new timbres. If you're interested my 2 generators can be found here...

https://madmonk13.github.io/relax/

https://madmonk13.github.io/musicforspaceports/

The first one is more of a proof of concept where as music for spaceports is much more feature complete.

Thanks again!