hidden menu feature? is that when you can adjust the settings when the radio is off? i read somthing about that in my manual i think. i don't like the hu611 because of the lack of a cd changer, not to mention that i want what came from the factory in my car not a second stringer. the dealer will be replacing it with the original if i can prove it.i called a diffrent dealer they wanted the vin # to run in the computer to tell me what the car came with. i'll find out tomorrow. chris