Do different characters sound different or is there one ‘voice’ that acts as a narrator?

Neither. I think of the idea of the words, rather than hearing the words in my mind. Which is to say, though I can read a sentence and string together the words I read in my mind, the l there is no voice to those words, no gender, no accent, no volume etc.

For me different characters have different voices. The narrative is either the voice of the character whose perspective is currently shown (which can lead to conflicts if I don't know the perspective at the start) or it is how I imagine the author to sound like or my own voice.

I do read extremely fast in my native language (Spanish). Feels like entire sentences go straight into concepts and my brain builds a whole world based on what I'm reading.

However I started reading in a verbalized way with my second and third languages (English and Swedish) because I was completely useless at pronunciation, while reading at a high level. So I had to learn the sounds and they started invading my reading, which I sort of resent.

But the verbalization is still very mild; faint, monotone, non-enunciated.

Some people talked about poetry and I hadn't considered that my absolute lack of poetry-sense could be related. People have told me about the metrics and whatnot and it really doesn't click. I have to sort of analyze a poem and explain it to myself in prose, and I imagine that defeats the purpose of poetry?

I do wonder if not having to ‘hear’ words changes the rhythm of reading.

Hadn't thought of this...what's your take on poetry, especially meter-forward? Like, Robert W Service or Robert Frost, I feel would be less interesting if they didn't have their beat.

I don't do voices or accents when I read. Everything is in the same 'voice,' which isn't quite the same as my spoken voice. My internal voice enunciates much better and slightly lower pitch. It's more like the voice I wish I had than the voice I do have. :)

I am pretty sure it does. From what I've heard people that essentially "read out loud" inside their head tend to have a have a slower reading pace. I don't think Anauralia is necessary to not do that, either.

Oh yeah, often I'll even have a specific person in mind playing the character: an actor, someone I know, etc. I often don't even realize that I'm doing this

if not having to ‘hear’ words changes the rhythm of reading.

Poetry instantly comes to mind. I have a very different experience when I silently read poetry vs. reading aloud or listening to someone read it aloud, especially when the poem is written with rhythm in mind.

it depends on if I heard a voice of that character before for example Batman is always Kevin Conroy and the joker is always Mark Hamill. another usecase is if I listened to the audio book then start reading a text book. Ray Potter shows up alot.