It depends on what stereo is in it, but out TT has three buttons labeled "A", "B", and "A+B" which is both inside and outside speakers. One of the other ones is for just the outside, and one for just the inside. If your stereo doesn't have those buttons, the fade setting may be what you want to adjust. Normally an auto stereo fades from the front to the rear, but yours may be wired so it fades from the inside to the outside speakers.
Some others may have another idea for you.
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