The Pioneer XM receiver on the same web site is "IP bus ready", which means you could probably hack it to feed into the empeg aux in without too many problems (you just need an adaptor don't you?). OK, controlling it would probably need a little more cleverness, but anything is possible - just need someone to write a program to control it over the empeg serial port, and build another small adaptor ...
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)