Rob McMillin of 6-4-2 starts with this:
My friend Craig Miller was the publicist for the first two Star Wars films. He asked me to encode and post these audio clips from an old cassette tape he had in his archives, which have an unusual explanation:
And the story gets better from there. Check out the link for original voice recordings from Harrison Ford, Carrie Fisher, Mark Hamill, Anthony Daniels and James Earl Jones!