Requires sox (apt-get install sox or http://sox.sourceforge.net)
Run 'sh generate_sounds'. Your directory should now have some sounds in it:
$ ls *ogg
tone_0.ogg tone_10.ogg tone_1.ogg tone_2.ogg
tone_3.ogg tone_4.ogg tone_5.ogg tone_6.ogg
tone_7.ogg tone_8.ogg tone_9.ogg
Open soundboard.html in chrome 9+ or firefox 4+, click some squares.
Uses d3.js available from http://mbostock.github.com/d3/