Old Vauqun/Sound Changes

Old Čeuň is a direct descendant of Proto Čeuň-Adzovŭd, and due to it's location at the easternmost extreme of PČA languages it earns the namesake of the proto language, along with its westernmost sister Proto Adzovŭd. Note that IPA will be used for all transcriptions of the languages in question, regardless of the phonemicity of their standard writing systems.

PČA Dialectal
PČA maintained a distinct Čeuň dialect for some time before the split. Various isoglosses are shared with P Kf (esp. E Kf languages). These dialectal rules include:

Expansion of I-Umlaut

[j] now triggers an I-Umlaut (explained in further detail on the PČA morphophonemics page)), only affects the syllable immediately preceding the [j], unless an [r] or [w] intervenes in which case the umlaut does not occur: [a æ o u] > [æ e e ɨ] / _$(C)(V)j !_...[rw]...j

U-Umlaut
 * togju > tegju
 * fatjo > fætjo
 * but nawkjo > nawkjo

[u] now triggers a rounding umlaut in the same conditions [i] triggers I-umlaut (long or word-final): [a æ e i ɨ] > [ɔ œ ø y ʉ] / _...u: OR _...u#. Unlike the I-umlaut, the U-umlaut affects both short and long vowels [w] behaves the same as [j], except it is blocked by [j] & [r]
 * e:vku > ø:vku
 * kɨnũːt > kʉnũːt
 * enweθk > ønweθk
 * but ajsiwte > ajsiwte

Rounding of ɨ

ɨ became ʉ when preceded by [x] [γ] or [w] and when followed by [v] [f] [m] or [w]


 * gnɨ:vo > gnʉ:vo
 * xɨ > xʉ