I wasn't there for the Alpha so I have no real comparison, but Ghost is a small, floating drone-type-thing. It has no lungs nor does it breathe air. A wizened, human voice would just sound odd for what the source was.
English
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You can search for it in Youtube, there are some people whom did an LP in the Alpha release
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I just found it recently actually. I had no idea it was Peter Dinklage. Still...I prefer the newer synthetic version. He did a better job at enunciating too.