I looked through the game files and found that there are actually quite a lot of audio files, some of which I'd never heard before. However, if I want a specific set of audio files, I'm still going to have to record my own at some point. Problem is, I have the most boring voice in the known universe!
To that end, I went hunting on my iPhone on the assumption that there might be an app for that
I've no idea how to then convert those files to .ogg format yet, but imagine there will be plenty of tools for that as .ogg is open source format.
Has anyone else tried this sort of thing before, and if so what did you use and did it work well?


