With 3.0 when using SD or USB as a source the nav guidance will be at the same volume level as the source and can be controlled by the knob. This is clearly stated in the manual. Not saying it's a smart way to do things, just saying there's a reason for it...
Absurd! What you just said doesn't even make sense. Maybe I'm missing something, but what are you talking about? I control the volume of voice guidance through the navi system menu, not the knob. The knob controls the overall volume of ALL audio. So what are you trying to say?
I'm not sure if it was the same for you in 2.0, but it was the same on my system, the SD volume was always lower than the radio or sat and it appeared that CD was louder than SD.
Now why your is backwards I don't know.. This sounds more like a system issue if its actually louder. You are correct, they did fix the playback which is really good. On a side note, USB music is lower as well. It would be nice if others chimed in one way or the other maybe mine is broke for all I know..
FYI - I just checked and if I crank up the volume to make the SD or USB louder and the navigation is going the voice is a lot louder. This appears to be issue with how the volume is controlling the SD or USB. I dont' touch my master volume in settings once they are set. Looks like Pioneer issue to me or As Designed.