I’m on ios/safari, no visualization on the linked page, and the links to the tutorial and api docs don’t work. Tried reloading multiple times.

Or maybe it is just not obvious that the background waves are a visualization. I just was reading this thread after going to the website and thought "I didn't see any visualization either". Then went back to the website and noticed the background.

Also, the title is "Document" -- not much good for bookmarks :-)