I just got a vehicle nav dock with the custom Motorola USB cable. The one with the 3.5mm jack on the regular USB end. I get audio out of the cable but it's very quiet. I have the volume on the phone all the up and when I unplug the 3.5mm cable I get loud audio out of the phone speaker and out of the head phone jack. I'm so concerned with the call volume, I don't get that many calls. I have read about that in other forums. Is there a setting I'm missing when I'm using this or is it a defective cable? Does anyone else have this issue? Thank you.