Bryan:
Thanks for the reply but am confused!  If I use one channel for the mic I already use on my Mackie mixer, how can I connect the mic input channel on the board so the mic I use from my mixer indirectly goes thru the mic input on the 2K?   I am thinking that one of my "send" openings needs to be somewhere in the layout.  If you could somehow do a drawing, I would understand it much better. If you need more info, ask and I will try and provide it!  :0)
Thank you...MikeF