The voice volume is called External volume, and can be found in the Audio menu. Traffic anouncments... well, I turned it off after it scared the *hit out of me a couple of times.
Hi,
I've messed around with the external volume settings too which seems to set the blue&me female voice ok, but every time the traffic news cuts in it scares the crap out of me, so I usually leave it turned off unless I really need it. If anyone knows how to fix this that would be great?