Audible thoughts are normal, as are inner dialogues. They are suggested as common hallucinations to experience. It was the pointing out of this that lead me to explore and find out that my audible everything besides thoughts as well, along with vivid and externally located imagery, scents, touch experiences and tastes, are not "normal". I'm apparently not supposed to be able to mime reaching out and feel myself grasping an apple from a tree in front of me, rubbing it on my shirt, smelling the sweet-tangy fruity scent of a pink lady, bite into it delicately as I feel the crunch and snap and the juices flood my mouth. I'm supposed to know what those things should feel like if they were happening, not actually experience them and just know that I'm generating the experience.
I even learned that this means I'm consciously directing the metabolization of memory, because other people can invoke hallucinations in themselves through effort, it's just not supposed to be an all-day everyday thing like it always has been for me.