How can I make my own level up sound?

In the Objet Window, go to all and type 'LevelUp'--it'll bring up a list of everything with that in the title. One of them is a sound that might be associated with it, but when I try to play it there's no sound at all... :S Maybe take a look at the others, and see if there's something there?

Alternatively, you could extract the music/sounds .bsa file, find the associated sound track, and re-create the path, putting a different file with the same name. I think that will over-ride the sound, the same way texture-replacers do.