Ubuntu 12.04 promised to add a brand new startup sound : http://www.youtube.com/watch?v=NgAj_gJ-TXA.
But its not there in the final release. There's no sound at all! I now know how to restore the old sounds back thanks to this question : How to add the old startup sound (not login sound)?
But my question is, how to add the new (or any other custom) startup sound to Ubuntu?