We have a Axxera radio also in our ACE. Not sure of the model but was told most do the mute thing when you try to add on other sources. For mine to work with the Aux-in, I have to turn the Axxera on first and then my other source (which is a i-pod). Once the sound level bars show up I can turn my iPod on and everything is a go. Note though, sound will be muted when you use the turn signals. Hope this helps. I want to replace it but haven't found anything to just drop in.
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