Starting position

Inventory

/p t k kʷ/ <p t k kw>
/ts tɕ/ <ts c>
/s ʂ ɕ/ <s ṣ ś>
/m n ɲ ŋ/ <m n ñ ṅ>
/l r j β/ <l r y w>
/a e ə o i ɨ u/ <ā e a o i ä u>
/əi əu oi/ <ay aw oy>
(or /ai au eu ou/? or /əi əu oi au/?)
/pʲ tsʲ kʲ lʲ (mʲ)/ <py tsy ky ly my>
(/r/ was never palatalized — possibly bunched or retroflex?)

Active processes

High vowel syncope

High vowels in open syllables could lose their syllabic content: /kuse/ [kʷse]. (Did this happen in B?)

Intervocalic lenition

p t k lenite to β d g between vowels.

Voice spreading

p t k voice to b d g after nasals (or any voiced consonants?).

Diphthong raising

/ai au/ were sometimes written with the base character for /e/, which may mean /ei eu/.
Toch. A monophthongized /ai au/ to /e o/.
There may also have been /āu/.

Stress assignment

Stress was on the second syllable of >2-syllable words and the first syllable of disyllables. This does not block high vowel syncope.

Unstressed central vowel raising

Unstressed ā a > a ä.

Absence of underlying high vowels

<i u> are actually /äy äw/...?
ä > i / C[palatal]_ _C[palatal]
(í ú > ay aw?)

Diphthong merger

eu > au (but word-final /ewä/ <eu> is preserved)
-ou# /owä/ > -au.
ai au > e o in some late/colloquial texts.

Palatal labial loss

py my > p m
pyä myä > pi mi

——

ku > kʷ / _[-stress] ! _$


ä > u / kʷ_ _kʷ
tɕ > tʂ
coda -r becomes rhoticity; -ir -är -ur > jɚ ɚ wɚ
tsʲ kʲ > tɕ

p kʷ gʷ > h p b (this b does not lenite intervocalically) (but kw gw dissimilate to k g if there's a labial in the next syllable)

ä > i / [+pal]_
ä > u / w_
geminates simplify