http://www.inudge.net.... this is basically the same thing, but you can add like 6 layers of different tones, plus there is a drum layer so you can add a beat
Now I'm confused. When I click on the OP's link I just get a page with squares that function the same as the original, but no menu and other instrument's like my link.
Oh well. It's definitely still a great way to burn time.