Yes, with Pure Data and Quartz composer.

As a JS hacker I wanted to bring that kind of coding to the browser for kids so I made http://meemoo.org/ as my thesis. Now I have linked up with http://noflojs.org/ to bring the concept to more general purpose JS, Node and browser.

I won't have really convinced myself until I rewrite the graph editor with the graph editor. Working on that now.