Bought TomTom App for my new iphone 4 to use in the car with built in blue tooth, phone sits in an active Brodit cradle. TomTom sound for directions disappears. I have tried everything but no joy.Would be happy if TomTom directions just came through phone speaker if thats all thats possible, as long as I can hear the directions. The car is a Volkswagen Tiguan if that is of any consequence! Thanks if anyone can help.