Mapos Buang has a larger sound inventory than is typical of most Austronesian languages.
* [ə] is a prominent feature of Buang phonology, but is not contrastive.
Vowel length is shown in the orthography by doubling the letter.
[2] */w/ is a bilabial approximant or semivowel with no co-articulated velar component.
It is placed in the labio-velar series of the chart as it fills a gap in this position.