Every audio sample is English — the mod is fully dubbed, and the lang
setting in personalities.xml controls subtitle text only, not the spoken language.
Supertonic is the shipping TTS engine. The mod ships 50 voice
styles: the ten originals (M1–M5, F1–F5) and the
forty VoiceLab pack voices (P00–P39). Many more names resolve to the
same style: Alex and M1 are the same voice, and each pack voice
also answers to a friendly name (Nate for P00, Nora for
P01, …). Every name a modder can write in personalities.xml is listed
under its card, so you can see exactly which names share a voice.