I just had this problem also with my new 25 Cruiser Aire. MartyinSC helped me figure it out. If your radio is the same as mine. Push mode button then adjust to fade. Turn silver knob left or right to adjust speakers from inside or outside or In between. I think the fade goes to 07. Here's mine.
__________________
*2016 CAF25SE Cruiser Aire 5er. *2020 Chevrolet 2500 HD Custom
*Ted & Tricia (Mimi - Teacup Poodle/ Sailor - Maltipoo)
*I have tried to live my life so that my family would love me and my friends would respect me. The others can do whatever the Hell they please!” —John Wayne