I’m no medical professional, however I was under the comprehension that auditory hallucinations feel like they are perceived as auditory stimuli. As if they were happening in the space around you. However, the voice of an alter has been likened to the voice your brain uses when you read or monologue your thoughts. Only, that internal voice, as an alter, has the ability of having their own thoughts and opinions. Alters aren’t always nice. And that can be hard to deal with. But I wish you the best of luck in learning you.