I would like to practice at night with the headphones on so I do not disturb anyone. I usually learn songs from Youtube. I would like to hear my guitar and Youtube from my MacBook on my headphones which are plugged into the Helix. I am continually stopping and starting the song. How would I hook up my MacBook to the Helix where I can hear both through my headphones? I have thunderbolt/HDMI/USB outputs from the MacBook. I would like to know the best connections to do this and what I would need. Thank You.