Zoe Toft has asked me to post this response:
In Epstein, M. (2000) All the sounds of all the world's languages. UCLA Working Papers in Phonetics, 99:1-3
it is claimed, on the basis of UPSID (317 langs), that there are 770 different 'sounds'. Of these, 359 occur in only 1 language.
Zoe Toft
Department of Linguistics
School of Oriental and African Studies
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