yes the chimes and all still work, even the lady can be heard, she has a seperate control, onstar is set to a defalt level, and you can turn up and down the volume with the knob.xrayman said:I guess you are probably right, but if you have to turn down the volume to not hear the radio, will the other audio for OnStar and the Nav system still be audible?? Haven't tried that yet. ???