Njebi language
Njebi (or Nzebi, Njabi, Ndzabi, Yinjebi, etc.) is a Bantu language spoken in Gabon and the Republic of Congo. Phonology

Consonants 

 /z/ is heard as [ʒ] when before /i/. /ɡ/ can be pronounced as [ɣ] or [x] in free variation. /b/ can be heard as an implosive [ɓ] in free variation in initial position. Vowels 

Vowel sounds may also be heard as tense in different positions. Example
Gabonese singer SeBa's writes and sings her songs in the Njebi language. References

Languages of Gabon
Nzebi languages
Languages of the Republic of the Congo