What you want is a bit tricky, as Cross has no dedicated Mic-channel in the software-mixer. (the mic on the U-Mix Control Pro (2) is a hardware channel)
Also you dont need to set the channel to mic in the prefs, line is fine.
solution/workaround for you:
switch to 4 decks -> set input 1/2 for the mic -> switch to line for player A, now the mic is routed thru player A and you can mix with deck C and D.
It's stupid, but atm the only way to have a mic routed thru Cross...
unless of course the mic is a hardware-channel.
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