Hi guys, today I just solved a huge audio problem for me that was vexing me for months. I could not figure out for the life of me how to capture my Axe FX guitar signal AND desktop audio (27 inch imac) and record both audio signals into Quicktime using my Logitech 1080p Pro webcam. I have the Axe FX connected to my iMac, but also have a SaphirePro40 firewire audio interface that I use to connect microphones and stuff. I tried outputting the Axe FX to my mixer then mixer output into SaphirePro Firewire and although technically this worked, I could never get balanced levels of desktop audio & axe fx going into my firewire interface; either the desktop audio was too loud or axe fx was too loud, I'd always get clipping, even after adjusting the levels of both axe fx & youtube videos. I couldn't understand why this was the case. Until I tried something I saw on a thread here in the forums; a guy suggested that I output my headphones out on Axe fx to a splitter; feed one of the headphones signal into my mixer then other headphones out to my headphones; then output mixer to my firewire interface then point Quicktime to my firewire....well, that worked. I don't get this at all !!!! What the hell is it about the Headphones Out that makes it so "special" compared to the Main Outs on the back of the Axe FX? Would love an an answer, thanks so much !!!!!