LiveScore

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Have fun!
Marc_G, January 2014

Tested with Firefox and Google Chrome on Linux and Safari and Google Chrome on OS-X. Performance of Google Chrome is significantly better than the others. To be honest, on my setup Firefox on Linux really sucks for this app.
No testing done on iOS, Android or other platforms. Volunteers? Anyone?

Credits:
http://processingjs.org
http://mudcu.be/midi-js