I know I'm late to the conversation, but here is the solution for anyone with the same question. Press the volume knob until the display shows "Fade", with the number 0 showing, the audio will be split between the inside speakers and the outside speakers. If you turn the knob to the right, the 0 will change to F1-F7 (F=front/inside) and the audio will be in the trailer. Turn the knob to the left and the 0 will change to R1-R7 (R=rear/outside) and the audio will come thru the outside speakers.
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