It depends on the character. I'm replacing the old computer generated ones with voice actors for some of the ones that didn't work as well.
Tsig is actually still generated, although sounding different now, but she's meant to sound like a bit of a computer. All of her lines are voiced in this way rather than just the main ones.
Revan by comparison, has been completely replaced by an actor.
KNIGHTS OF THE OLD REPUBLIC : THE JEDI MASTERS
PLAY THE TOTAL CONVERSION MOD NOW! . | If you're interested, my almighty fanfic can be read here.