How to modify sound for heroes

[Daddison]

Hi all, first-time modder here! My current project is a map of Corellia with young Han Solo.

I've already created the texture for my new Han, but now I want to change his voicelines/music with files of my own. However, I can't find any of the sound files referenced in his odf in sides or in sound. My best guess would be that they're already part of the munged files, but if so, is it even possible to edit them?

Any help would be much appreciated.