Attached is a zip file containing several python scripts that allow you to change the voice that CrewChief uses. It will use the default Microsoft voice on your computer, which is then filtered and smaugged to have a "radio-y" effect. You can do these things:
Have custom messages for every event in the CrewChief voice library.
Have your own personalization.
Have your own set of drivers.
The scripts use two commandline programs--balcon to create the wav files and sox to do the filtering and snooshing. This uses the balcon text to speech engine, so the audio will not sound like a real voice...the intonation and inflection are just not there. But once it game, it's really not that bad.
I created this because I wanted the accent of my homeland and I wanted my own messages. I wanted my crewchief to tell me: "If you run off the track again, you'll be a greeter at WalMart next weekend" and things like that. And I wanted my own set of drivers (I use great authors).
Oh, it was written for Race Factor 2. I should have said that earlier. I'm not sure of the setup for other sims, but all the scripts are editable with a standard text editor so you could change them to your heart's content.
[Edit] Fixed syntax error in attached file.