The media player position is set by the use of jumper wires to the interface, not its physical location on the MOST bus. I'm going to guess that the Mr12 volt box probably has position 1 by default, so you'll have to add the jumper wire to the CD player.
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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