Att is for attenuator. It turns the volume down so you can have a conversation or whatever. There will probably be a pale blue wire which will activate this feature if connected to the mute wire on a hands free phone kit. You may find that you can activate it by briefly touching the on off button or something like that.
As we say in the trade ';RTFM';.... read the flipping manual!!On my sony car remote control there is ATT, button but I can not find it on my sony car radio model XR_M500R
probally only option for you is to use the remote for that
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