How To add the new startup sound to Ubuntu 12.04?

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http://askubuntu.com – 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? (HowTos)