I don't usually hear words in any way while I read, because I essentially read instantaneously and process written language in a way that's not entirely dependent on spoken language like how, say, deaf people clearly don't have to speak to be able to sign (but unlike deaf people signing I do almost certainly process written language as being somehow equivalent to spoken.) I have associated voices for people based on what they write, though, so I can easily imagine them saying things but I'm not sitting down and pretending to talk to them while I'm reading them, it's much faster than actual talking usually is. (You can talk that fast, but I tend to think information is lost in terms of acoustics when you do so I usually prefer writing over talking. Talking feels like a pale shadow.)