Nasal sounds [m n ŋ] are variants of voiced stops /b d ɡ/ between nasal vowels. Stops may also be heard as prenasalized [ᵐb ⁿd ᵑɡ] after nasal vowels. /w/ can be heard as a nasal bilabial semivowel [β̞̃] in the environment of nasal vowels. Allophones of /ɾ/ can be heard as [ɾ̃], [ɺ].23
Ramirez, Henri (2019). "uúku͂sehe (ye'pâ-masa yee uúku͂sehé)" (PDF). A Fala Tukano dos Ye’pâ-Masa, Tomo II: Dicionário (versão atualizada, 2019). Manaus: Inspetoria Salesiana Missionária da Amazônia. p. 194. https://acervo.socioambiental.org/sites/default/files/documents/TKL00020.pdf ↩
West, Birdie; Welch, Betty (1967). Phonemic system of Tucano. Viola G. Waterhouse (ed.), Phonemic systems of Colombian languages: Norman: Summer Institute of Linguistics of the University of Oklahoma. pp. 11–24.{{cite book}}: CS1 maint: publisher location (link) /wiki/Template:Cite_book ↩
Aikhenvald, 1996. ↩