I understand you regarding sub-lucid, I had same kind of dreams when I wanted to quit LDing and I wanted to have non-lucid dreams. I never succeeded in having non-lucid, but I found a way to make it easier for me. I also observed dream like a movie, always knowing that I can control it, but would usually not intrude.
Here is my description of it - Observer Lucid Dreams.
[My Dream Types.)
I also had similar situation where voice was talking to me, I had them very often. In my LD’s, sometimes I would go to some distant place where I could relax, sometimes I was sitting and listening to that voice, he was telling me some interesting ideas. Absolutely random, voice talked about everything.
Also sometimes this voice commented my ongoing LD, giving some ideas on why some events are happening in this dream, like doing a brief introduction.
I think in this case we are reading our own subconscious mind.