Any of you fellows ever mic'd an open back and closed back cab at the same time live? Using the 3rd Power 3015, I am sending all of my dirty presets through "Amp 1 Out" to one side of the amp and closed back Marshall 2x12, and am sending my cleans to "Amp 2 Out" to one side of the amp and open back Avatar 2x12 (it worked!!). Totally different tones from each side and speaker, but want to use them live. Suggestions? Thoughts??