I've owned a couple of Lexus' in the past and I'm considering buying the GS, but in driving loaner cars from the dealer and test-driving the new one, I've noticed that you can't keep the audio display to stay with displaying the XM song/artist info. You can hit the audio button, but it keeps reverting to the map display. It's kind of annoying, if you're monitoring the songs as they're coming across XM. Is there a way to keep the display in the audio mode. That has to be a setup feature. Does anybody know?