Hi 21C Peasant,
I think the YouTube channel Star Wars Story is what you are looking for regarding your statement about the Darth Vader voice:
Darth Vader’s voice is changed to be more in line with what we hear in the original trilogy. (I’m struggling to re-find the Youtube video where I found this voice work. It was my favorite of the several available, and I’d really like to give credit where it’s due.)