 The other types of phonation have been variously termed checked vowels, creaky voice vowels and breathy voice vowels.Some Mixe variants are vowel innovative and some, notably North Highland Mixe, have complicated umlaut systems raising vowel qualities in certain phonological environments.The morphosyntactic alignment of Mixe is ergative and it also has an obviative system which serves to distinguish between verb participants in reference to its direct–inverse system.