Klavs81
Rear Admiral
Here's Why Luke Sounded So Weird in The Book of Boba Fett
Luke Skywalker's return in Book of Boba Fett Episode 6, has had fans react with mixed agreement on just how much the visual and audio effects to create a young Mark Hamill worked. It turns out there's a reason for the off voice, though.
gizmodo.com
The Respeecher staff also used the High Resolution video packs from Wing Commander IV and III by Owen Davies. A veritable treasure trove of ~10 aby Mark Hamill audio! I know because I provided it to them during a collaborative project last year.