Re: voice;
Zearth was... I think my friend said it was about 500 meters high. It had a big cockpit full of chairs, one for each pilot, and it just teleported you in and out - there was no door or ladder or anything. When you were piloting, you'd think about how you wanted it to move, and it'd do what you thought.
[Leaving out the uglier parts about Zearth for now.]
I know that all probably sounds crazy, but it's true.