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

Other sounds:
a labio-velar central approximant [w]
voiceless dental fricative and /h/ in new loans and hypercorrected forms
labiovelar sounds /kp/ and /gb/
nasalized counterparts of all vowels
three diphthongs
high and low tones

(from: Coomber, M. E. A. 1969. A Descriptive Study of Krio Phonology (M.S. Thesis). Georgetown University.
Fyle, C.F., and Jones, E. 1980. A Krio-English Dictionary. Oxford: Oxford University Press.
Ladefoged, P. 1964. A Phonetic Study of West African Languages. Cambridge: University Press. )