Basaa language
Basaa (also spelled Bassa, Basa, Bissa), or Mbene, is a Bantu language spoken in Cameroon. It is spoken by about 300,000 people in Centre and Littoral provinces.
Maho (2009) lists North and South Kogo as dialects.
Phonology
Vowels
Consonants
When not root-initial and not after a pause, the voiceless stops /p t k/ are realized as voiced stops or voiced fricatives.
Tone
Basaa contrasts four tones: high, low, high-to-low (falling) and low-to-high (rising).
References
Hyman, Larry M. (2003). "Basaá (A.43)". In Nurse, Derek and Philippson, Gérard (ed.). The Bantu Languages. Routledge. pp. 257–282. ISBN 0-7007-1134-1.