I could only get the basic beat after tapping Start Demo on my iPad. I couldn't mix in with the selection buttons :( I could see some toggled on, couldn't toggle them off and vice-versa, whether the demo was started or stopped.
Those aren't toggles. They are just the elements that get animated during the demo. Each one is a demo of the CSS to the right of them. The ones that are colors are just that way because the demo won't work well with empty shapes.