Is there a way to have the radio cut off when a voice direction is given by the Navi? I have a problem understanding clearly when the navi voice comes on left speaker while the radio still play on the right speaker? Is that normal? Even with the GPS on max volume (11) it still is hard to understand at times. My old after market GPS/Radio/Dvd unit that I had on my Civic will cut the radio sound when giving voice direction and back to the radio after that.
Can this be achieved with this fancy, full of gadgets automobile?

Thanks