How they got Alec Guinness to say "REY" in THE FORCE AWAKENS

Upon learning confirmation that the voice of Sir Alec Guinness was added along with Ewan McGregor's voice to Rey's Force vision in STAR WARS: THE FORCE AWAKENS (aka "The Forceback"), we reported to the RFR Sound Lab to conduct a quick experiment: How did the filmmakers get Alec Guinness say "Rey" in the film? We discover what was used as source material and deconstruct the scene. Then, using essentially the very same methods as Skywalker Sound, we recreate the sound of Old Ben Kenobi calling out for "Rey".