Budu language

Budu (Ɨbʉdhʉ) is a Bantu language spoken by the Budu people in the Wamba Territory in the Orientale Province of the Democratic Republic of the Congo. Its orthography uses the special characters ɨ, ʉ, ɛ and ɔ, as well as modifier letters colon ꞉ and equal sign ꞊ for grammatical tone, marking past and future tense, respectively.
A variety of this language is called Matta and is spoken locally both north and south of Maboma.