Dear OneofMany
You certainly posted this in the right place. Your avatar is the key to the 'voices' coming out. It has to feel safe. I do have different voices that come out of my head though my mouth and its not in my normal voice and I am stuck behind those words. I don't know what they are saying. They only came out when they trust a person enough.
So basically its something you really cant force. Sometimes now I wish one of them would shut up. But I cant stop it.
Keep writing and drawing and relax. Maybe writing/drawing is their way of communicating? Its safe.
Possum