Matlang, Day 2

Today, I'll be doing those lovely airflows modified by your tongue's location. That's right, vowels!

Pre-Matlang Vowels
These are the basic sound correspondences:

Gr La PM
e  e  *e
a  a  *a
o  o  *o
e     *eə
a  a  *aə
o     *oə
ē  ē  *ē
ā  ā  *ā
ō  ō  *ō
i  i  *i
ī  ī  *ī
ī  īa *ei
ū  oe *oi
ai ae *ai
āi ī  *āi
āi ō  *ōi
u  u  *u
ū  ū  *ū
eu ū  *eu
ou ū  *ou
au au *au

So this is our system:
Monophthongs: /a e i o u a: e: i: o: u:/
-i Diphthongs: /ei ai oi a:i o:i/
-u Diphthongs: /eu ou au/
-ə Diphthongs: /eə aə oə/