Changing crew voices?

[Halifax40]

In port before patrol 6 (as in I haven't started it yet): I used SH3 Commander to tailor my crew to my liking - names and what not, still use in-game awards allocation etc etc. It's come to my attention that my Navigator sounds like he's been, well.. hit somewhere with a torpedo when he was hanging out in the bow torpedo room, if you get my meaning. I already know about the voice index and what not and got a free .ogg player to sample the different voices in the speech folder but I'm curious as to how to change that certain officer's voice. Only thing I can see is by going into My Documents/SH3/data/cfg/careers/Shermshulze/Crew_Career_50 and then altering that cfg file for his voice index.

Any ideas?