If there really are three basic modes of autistic thought, I would suspect that for each of us one mode is dominant, with the other two operational when needed. I mean, I'm a music / pattern thinker, but I have learned to write. The more I write, the stronger the links I create between my pattern language and my verbal language, so that I can write well.
Likewise for visuality. I have learned to identify patterns in what I see so that I can recreate images in my head and draw them. But as you might suspect, this works best for geometric and architectural subjects.
So I hypothesize all of us are like this.
However, if any one of you believes that you do not have one mode which is truly dominant, I would like to hear (notice I used the verb "hear", not "see" or "read"?) your explanation for what happens inside your head.