Oh boy, where do we start? I've never done such a thing myself, but I'm sure it's possible. Uhh... well I do know is that you'll need SimPE to poke around in the game files (for 2). If it's of any help, the voice files are stored in The Sims 2\TSData\Res\Sound, and I'm assuming this applies to Expansion Packs too? Now, as for TS1, you'd need a specific program for that, I think. Let me get back to you on that, and see if I can find one!