Welcome to the mazda3forums. I'm new here myself, still trying to get enough posts to qualify for pm privileges - this may be the one!
xcarlink looks suspiciously similar to audio link; in fact, it is. icspots has a comprehensive introduction to audio options in the link below. Look under Ipod Integration
Auxiliary audio inputs, and ipod integration options
It's located at the very top of the 'Electronics Discussion' index page. Lots of good readin' in the 'Child Boards'. Practice searching for topics of interest too, it will save you lots of time and frustration.
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