they were using digital techniques on songs like 'the right stuff' as early as 1988 to help fix their subpar vocals. columbia records did not want to release a dud, and they recruited computer scientists to work with their audio engineers to polish their product. it's a little-known aspect of music history.
i saw it in a tech magazine years ago. you can hear some of the more obvious spots where they applied pitch correction, like the word 'wanted' in the pre-chorus around 2:18 of the right stuff: