a nother thing to consiter is do you want to use the TA featur on the radio.
if so you must use mpeg -> CD/Radio-amp

Mark
wait for mk III with a USB Host/slave
(USB->Ethernet)(USB->COM 1-8)(USB->You name it)
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Mark wait for mk III with a USB Host/slave (USB->GPS)(USB->Bluetooth)(USB->You name it)