Creator of Sporth here. AudioMasher is a really cool project! Projects like this make me really glad I open sourced Sporth. It's really cool to see what sorts of things people will use it for. In addition to learning the API and porting it to the web (with no assistance from me), Pierre has also composed some very beautiful patches in Sporth using his AudioMasher tool. It is always easier to leave things as a "technical demo", so I appreciate the extra effort.
You kind learn more about Sporth here: https://pbat.ch/proj/sporth.html and the code can be downloaded here: https://www.github.com/paulbatchelor/sporth.git