You can mute the voice audio in the menu
Yes mute the voices in the sounds tab. There are a couple instances where it suddenly starts talking to you but I think this is an audio glitch.
One is volunteering for the Heimlich demonstration but it only says like one or two words then disappears again.
The other is right after being honest during the standing in file, a strange scene appears that makes no sense where you are sitting in some sort of court martial and the "justice" speaks and you character responds and then suddenly you are sitting in the locker room.