I have my sky Q mini box connected to a 4k TV via HDMI. I have my PC connected to the same TV via HDMI and also to an X34a via DP cable. I have all PC content coming through my PC headphones, but obviously the Sky content is coming through the TV speakers but I want that to come through my headphones also. Could I run a digital audio cable between Sky box and PC? Or, would I have to run the DO cable from the TV to the PC?