these are the sounds found in most native Mandingo dialects:
there are also sounds not on the chart

Other sounds:
labiovelar central approximant /w/
labiovelar sound /gb/
palatalized counterparts of /t/ and /d/
nasalized counterparts of all vowels
high front rounded vowel as an allophone of /i/ and/or /u/
vowels can be long or short
tone in pronunciation of certain words

(from: Uspenskii, B. A. (ed.). 1965. Iazyki Afriki. Moskva: Nauka.
Westermann, D., and Ward, I. C. 1990. Practical Phonetics for Students of African Languages. London: Kegan Paul International.)