I have a kenwood kdc-mp832u head deck, i love it but when i hook my ipod up to the usb it wont read it...it will charge it but wont play the music....so i tried hooking it to the AUX and the only way i can get it to play through there is when i turn "zone 2" off or on i dont remember and then it only plays through the back speakers while the radio plays through the front....How can i get it to play? Thanks