I have looked for this in the search button and I cannot find it. How do you set up 2 h9’s through the pre/post feature using your amp loop and the front of the amp? can this be done? if not is one behind the amp and one always in front? I figured out how to do both using the loop but have not figured out how to route both in front and behind like the instructional video shows. it only shows how to route 1 H9