Apologies for the late response. Unfortunatly, it has been quite a while since I've played the game, and since then i had to hard restart my computer, which unfortunatley reset my settings.
Whatever the effect was, I don't remember it being a dealbreaker, but your mileage may vary.
It either made no noise or was pitched in a way that didn't make it too weird, at least thats how i remember it anyway. I apologize if it ends up making everyone replace animalese with moanalese :c.
Either way, good luck!
(Ps: If by this time the old audio files have been patched out, you can find them again by downloading older versions of the game and extracting the audio files there.)