I'm so happy that this is a thing <3
Could you explain what sound é and á make, and why there are double vowels??
e - like e in met and a - like a in father
You do high tones in English all the time. Say these phrases. You’re pregnant. YOU’RE PREGNANT?! The latter is higher pitch. So, same concept for Navajo vowels. It doesn’t matter how high you raise your voice as long as it is distinct from your normal speech.
Double vowels can change the meaning of a word. For example, bito', his/her/its water; bitoo', his/her/its juice. Hope this helps.
I would add to daydiljahhi's response that double vowels also elongate the sound a bit more.