The pronunciation of "O"

According to "Lessons" section, "O" is supposed to be pronounced like "oe" in "foe".

And "O" in "dovah" is pronounced this way. 

But according to ingame audio, "lok" and "volaan" along with several other words have "O" pronounced like "o" in "soft". 

Does the letter "O" have two ways to pronounce in Dovahzul?

If so, is there any rules we can follow? 

Are the words "lost"  and "do" pronounced the same way as they are in English? 

Category: General