I've made some .Wav files for you to use as startup and exit sound. I tried to keep the African Ubuntu feel to the sounds. Please let me know what you think.
ubuntu-art.org Click here...
I've also made some alternative sounds that I've attached as zipped .mp3 files below. !Note that the files below are alternative sounds and does not include the two default files from Ubuntu-art.org
Get them here:
Alternative Ubuntu sounds as mp3.zip