yoda-sama said:

Actually, about Jango and Boba, in the PT did we ever really hear Jango talk with his mask on? In the OOT, Boba only talks with his mask on, and sounds like his voice is modified a bit by the helmet. If he didn't develop the silly accent (by not visiting the "down under" part of the galaxy? You tell me), then it wouldn't be hard to explain the differences of Boba's helmet voice to Jango's non-helmet voice.

Exactly! I hadn't even thought of how the helmet would change a person's voice. To me it was just entirely plausible that the OOT version was how Boba's voice naturally sounded, even without the helmet, and that his voice box might've been injured in a fight or something.