okay.. phatbox and sat radio do do use separate cables, but there is only one aux input on the head unit - bad design. people have integrated both, however it is apparently a wiring nightmare and will most likely void whatever warranty the audio equipment has
audi has been promising a cable to accommodate both for some time now. apparently it'll be out by july. might want to wait and see what they come up with before your installer butchers the wiring harnesses
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