Hi OOBD,
could be anything. You can try to find out using different approaches. Best would be you go again in this consciousness state and then attempt to
-go to the "place" where you heard the voice
-ask who it was and/or what it means
-try to meet this person

Either affirmate it at the beginning of the relaxation, or when you're in it. The first would be good because it would not directly force you to see anything (could be defocusing or make you phantasize), the second is good because (at least for me) you get nearly always results.

Spooky

I once had an out of body experience where I felt like God was my guide. I felt like a little kid in his presence. I asked how I've been doing, and I felt a hand pat me on the shoulder as if to say, "good." So who knows outofbodydude. Sometimes it's okay to think big. An example of thinking big is when Bruce Moen communicated with the planning intelligence and Robert Monroe communicated with the creator.