Yeah, I have conversations with mine. When they don't respond to me or I'm trying to convince one to be more "visible" I just talk to them anyway. I just assume that when I address them they perk up and listen. That seems to actually be the case. Of course, I have to be polite too! Otherwise I don't think theyd ever talk to me. Not like, Hey I'm talking to you! But more like, hello, I'm sort of lonely and looking for someone to talk to me, please...I don't know how you feel about talking to me and maybe you don't want to but I sure would like to chat, etc. I had one that started talking to me two days after my request. Turns out she was totally listening but just wanted to talk on her own terms.
I also have a meeting place in my head. My T taught me this and is super helpful-it's helped me meet some that weren't okay with talking yet. The meeting place is a beautiful house, and everyone has a their own room. I "sit" in the living room sometimes and use the intercom to ask whoever wants to come to a meeting. I just take note of who shows up and where they are, and just get used to being with them like that. Most of them are too shy to talk and they need to get used to me and trust me first. The key with the house meeting is to really observe, rather than try to control or create or force things to make sense. This allows the other parts to participate in projecting what they want to communicate about themselves into the shared space (if that makes sense). I observe the things that come to mind. The house is also a safe place and it has no rules. We could have a pool in the kitchen if we wanted, or live in a castle!
And sometimes no one talks anyway. And sometimes it's too many.