I've played up to and including the first "real" double date. But so far I have not heard any voice acting at all. Is this a bug? Or just how the game is?

Nevermind. I say this and next second I touch my headset's cable and hear the voice acting. Guess there's some weird issue with my headphone's cable and for some reason the music goes through no problem, but the voices get cut out... Maybe stereo of some kind... Disregard, I guess