The voiced allophone of /x/, a 'voiced velar fricative', apparently contrasts with /ɣ/, a 'voiced lenis velar fricative' which can only appear root-initially. (Presumably an approximant?)
Allophonic rules
p >
b / m_
t >
d / n_
k >
ʔ / _# _m
k >
g / n_
ts̪ >
dz̪ / n_
ɸ >
β / word-medially
s >
z / word-medially
x >
ɣ / word-medially
n >
ŋ / _k
n >~
ŋ / _#
l̪͆ >
l̪ / (non-canonical form - i.e. alternate representation of the phoneme)