The whoosh of Luke Skywalker's landspeeder was achieved by recording the roar the Los Angeles Harbor Freeway through a vacuum-cleaner pipe. A language created by altering and layering Tibetan, Mongolian, and Nepali languages . I broke the sounds down phonetically, and red-edited them together to make composite words and sentences. I would always use a fair amount of the actual languages, combined with purely made-up words. With a new language, the most important goal is to create emotional clarity.
People spend all of their lives learning to identify voices.
You became an expert at that, and somewhat impossible to electronically process the human characteristic, and retain the necessary emotion. To fool the audience into believing this is a real character as the basis of the sound, although you may sprinkle other things in there. It varies from character to character. The unique sound effects of Star Wars. Burt has a keen ear for the compelling sounds, but what makes his works special is how his effects vault to a film's foreground.