/dʒ/ occurs in loans. /h/,/s/,/ʔ/ are found in loans and a small number of native words, such as /buahaŋa/ 'k.o. cricket', /sio/ 'nine', /naʔal/ 'bark slippers'.
/β/ only occurs before /u/, but there are near-minimal pairs such as /βuŋo/ 'fruit', /buŋol/ 'leaf'.
/l/ is pronounced [l] after a front vowel, as in [dila] 'tongue'; [ɽ] if not preceded, but followed by a front vowel, as in [aɽe] 'chin'; and [ʎ] elsewhere. However, there is an exception with the sequences /lala,lola,lolo/, where the first /l/ is pronounced [l], as in /lolo/[loʎo] 'face'.
References
^Buol at Ethnologue (18th ed., 2015) (subscription required)
^Zobel, Erik (2005). "Buol". In Adelaar, K. Alexander; Himmelmann, Nikolaus (eds.). The Austronesian Languages of Asia and Madagascar. London: Routledge. pp. 625–648. ISBN0-7007-1286-0.
Further reading
Ahmad, Garantjang; Arnir Kadir; Dahlan Kajia; Zohra Mahmud (1986). Struktur Bahasa Buol [Buol Language Structure] (in Indonesian). Jakarta: Pusat Pembinaan dan Pengembangan Bahasa.