I can't turn it up!! CD's with MP3's can't be turned upad , I turn the knob tell I'm blue in the face :ugh but nothing. A normal CD will knock you out of the seat :bash but mp3's are just to soft. I'm recording them with nero right off my music CD's. Anyone else have this problem and maybe a fix. I have the Bose Nav system, in a 2005. This car needed the updated software to play MP3 and I think that may be the problem ??