What buttons to push on Mackie 1604 after hooking up fx to aux in and out.

Sander Gordon

Honorable
Aug 23, 2013
1
0
10,510
OK, I get how to hook up the FX unit to the aux...I'm using aux 3 in and out, but, I don't get any fx coming through. I don't know where to go from here. I think it's somewhere on the right side of the mixing board but, I too have no clue. HELP!