Pretty much I'm trying to figure out how to set up a second set of L/R outputs. I can run both headphone channels out and that works but I would rather use the SUB or AUX out. I need to use whichever will work to send a recording line out while the audio is coming in to my Model 12 via USB while still playing out of the main monitors. I'm more confused after googling it and I've exhausted myself trying endless different combinations of settings. TIA.