The second host of SpaceShip Earth is the one most people remember as being the voice of the attraction - and really the voice of Epcot. Of course, he's uncle Walter - Walter Cronkite. Respected as a journalist, Cronkite adds a certain authority to the audio. On this show, its Walter's narration of SpaceShip Earth.
His voice could be heard from 1986-1995, but to me he will always be *the* voice of the attraction. This was certainly the version I enjoyed the most.