Oh yeah this is super dope. The reason why this works is that Max is a 3rd party programming interface for audio, and Live can interface with Max, hence "Max fo

Oh yeah this is super dope. The reason why this works is that Max is a 3rd party programming interface for audio, and Live can interface with Max, hence "Max for Live." It uses some subset of JavaScript. Anybody can develop stuff like this and a lot do, but it's quite challenging in my experience and fortunately Ableton does amazing work like this and always releases their own Max stuff.