I just hadthe Radio Module replaced in my '02 X5 with Mk III Nav and no DSP and now when I am listening to a CD or the Radio, when I hit Info it displays a new option with RDS and PTY called Nav-Min or or something like that. When I hit the select button it goes to an adjustment option for + and -. Is this a way to adjust the Nav voice prompt volume or relative volume without going through the service/hidden menu?