My coach has a Jensen radio in the coach that feeds the inside and outside speakers. On my unit I have a set of 3 buttons. Marked "A", "B" and "C". The "A" button operates the interior front speakers. The "B" button operates the bedroom speakers and the "C" operates the outside speakers. Those 3 buttons only turn them on or off. The Jensen system volume switch controls how much sound goes through it. This may or may not help you with your system. You can try looking it up on YouTube for help.
Paul
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