It's based on the side you are on.
If you are on red you get russian voice acting.
I haven't tested game but the english-russian voices where awful and if they are set to russian then that's awesome.
What the hell are you on about?
They give you option to buy BS 2 cheaper, they are not pushing you to do anything.
Buy the full BS2 like I did if you feel the upgrade stuff to be annoying, a grade schooler could figure this stuff out.
The easiest way to get help would be if you submit a track file.
Basically just start a mission, start the Hog as you usually do then exit and there should be a button that say save track (or something like that) then you can post that file on the forums.