Cheetah sounds include purrs, bleats, barks, growls, hisses and chirps- but no ROAR-R-R!! Many of their sounds are totally unlike those of any other cat.
WHY BIG CATS CAN ROAR - M.H.Hast (External Site)

Chirping: like a bird's chirp or a dog's yelp - an intense chirp that can be heard a mile away! Right click to download the sound HERE. (It's a small .wav file)
Churring: staccato growl, high-pitched
Nyam-nyam: cubs' sound when feeding
Ihn-ihn: mother's call to her young
Purring: like a house cat
Staccato purring: sound made by courting males
Bleating: like a meow - a distress call