How do the mic inputs work on the back of an NS6? Will they affect how many decks I can use on VDJ Pro 8?

If I am using a Numark NS6 with Virtual DJ Pro version 8 and I have two (2) 1/4" mic inputs being used on the back of the unit (Channels 1 and 4), will I still be able to use a 4 deck layout when running the software on my MacBook Pro laptop? Thank you!
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