Andoke is spoken in the upper Amazon basin in
Colombia. Landaburu analyses it as a tone language with
two level tones. Nasalized vowels occur word-initially,
but elsewhere only after nasal consonants. Consequently
nasals can be analyzed as allohpones of voiced stops. The
sounds represented as palato-alveolar affricates here
apparently vary considerably from (palatal) plosives, to
(postalveolar) affricates, to [s] and [j] for voiceless
and voiced cases respectively. Syllables may be closed by
a glottal stop - Landaburu treats this as a feature of the
vowels.

Landaburu, J. 1979. La Langue des Andoke (Amazonie
colombienne) Grammaire. Centre National de la Recherche
Scientifique.