"The first transport is away."

I know that Mark Hamill provided a voice for that announcement in Empire. But that voice is not consistent between releases. For some reason I have it in my head that it’s always Mark Hamill just pitched down to the point of being unrecognizable in some versions, though I don’t remember where I got that idea and I have a hard time believing it. I’m hoping someone on here knows exactly what’s up with that line. Is it always Hamill or was it/is it someone else? Is it a mono vs. stereo thing? Or was it something changed in a subsequent release?

Just from my memory, it was originally someone else and it was changed to Hamill in 1997.