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The audio should sound better, but the relative level of the sound for each application will remain the same. So, if the problem is that with the music comfortable the Nav software can't be heard, that same thing will happen through the aux-in. It may be better because the sound could be larger for both, but if the music covers up the voice now, it will then, too. Maybe you can get a set of earphones and just try that to see what effect that has on the situation before you invest in a new in-dash deck. If it's still bad on a good set of earphones, it'll be bad on the in-deck.
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