Stress being on where - and not only but also on when. Due is from times when French was hip and foxy at the court royal. I'm sure you can tell many first hand tales about that. Wherever in the many different English speaking parts of the world you are.

edit: more to the point, "dues" is pronounced "doos" in one dialect or another, I assure you. This is because it has nothing to do with "mountain dew".