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The tone mode that you select is remembered by the preset stations of the radio. Put each stations tone where you want it, then re-save that station into the radios presets.
The radio presets are then remembered by the memory buttons. Once you have all of your presets properly set, then re-program your memory button by holding the button down. All of your stations and their proper tone setting should then be available every time you unlock the doors with your fob.