I have read the manual, and watched all the YouTube videos, but I still cannot figure out how to monitor what I'm playing on guitar using headphones plugged in to my PC. I'm using Studio One, and when using the Mixer I can see that my guitar is being picked up, but clicking on the Monitor button does nothing, presumably because I don't have headphones plugged in to the rear-output. I can't find an option in either Studio One, or the Universal Control program to choose an output, either. I don't own a pair of headphones with a 1/4" jack, and I really don't want to have to buy a pair just to hear my guitar in real-time. If someone could please explain how I can monitor my guitar using my PC headphones, I would REALLY appreciate it! Thank you!