[albee1952]

A few more things to consider; open Setup>Hardware and check to see if SPDIF=RCA and ADAT=Optical. In the IO setup>Input tab, you can try DEFAULT, or try adding paths manually(add 8 mono paths and then click the grid so they are assigned to inputs 9 thru 16, which correspond to the ADAT inputs). Makre sure your lightpipe "cable" is plugged all the way in at both ends(those plastic connections are crappy). Back on the Hardware page, set Clock source to Optical(if you DON'T do this, either the Mackie inputs won't work, or they will work with tons of clicks and pops from improper clocking).