So to summarize if I got this correct.
- AudioPilot is a fancy noise compensation feature for road noise, open windows, higher speeds, etc
- Driver's Stage pushes sound to be more balanced towards the driver and should be off when passengers are in the vehicle
- Centerpoint - ??
Also the surround level is a sub menu for which one and does it really augments the surround effect?
I think center point ultimately stages the audio in the center of the vehicle but it has a surround effect that makes it feel like the audio is bouncing from the center toward your ears... at least that's what it sounds like to me. It has a wider, more airy range and seems to make highs more prominent at the expense of some bass. With a full car, I can see how it might sound good and with certain types of music and I did enjoy the effect at times. In any case, it only functions for certain audio sources, as evidenced by the inability to adjust surround effect on AM/FM. So to answer your question, the surround menu applies to the Centerpoint effect.
Still, I am a purist when it comes to audio so I have all of the staging disabled (but do utilize the audio-pilot feature). Haven't found "my" perfect setting yet for the few level adjustments that we. I actually dislike the driver stage as it sounds too "artificial" for my tastes.
Audio is just like picture quality on a TV: some people love it cool, bright and sharp, others prefer the more pure warm, soft and dim settings.