"Something people didn't realize is that his voice isn't real. His voice, the young Luke Skywalker voice, is completely synthesized using an application called Respeecher."
Matthew Wood (Monteur Son) :
"It's a neural network you feed information into and it learns. So I had archival material from Mark in that era. We had clean recorded ADR from the original films, a book on tape he'd done from those eras, and then also Star Wars radio plays he had done back in that time. I was able to get clean recordings of that, feed it into the system, and they were able to slice it up and feed their neural network to learn this data."