You will not be able to aggregate the sound card on any K2 connected via X:link. So K2 <X:Link> K2 --> USB 1 on the Mac will give you output 1-2 and output 3-4 on the K2 connected to USB. Because you're connected via X:Link to the other K2 you will not be able to use its sound card.
Just to clarify output 1-2 is l-r headphones on the front and 3-4 is l-r of the main RCS's on the back.
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