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So the expansion card in the xDR is exactly the same as the one in a mixrack? Does that hold even with 2 xDRs? so I could connect 2 xDR units to a mixrack and instantly get one more expansion card than I started with? I would be using wireless IEMs so im not worried about passing audio through to the iPad, though that would seem like a biggie for PAFL use. Thanks for these replies, very helpful!