there all brand new cables, from the soundcard i have a dual headphone 1/8 headphone jack, plugged into 1 of the inputs is a 1/8 regular pair of headphones, plugged into the other one is a 1/9 to 1/4 converter then a headphone wire, then thats plugged into a y adpater. i had to get the y adapter so i can hear the beat and the headphones at the same time. The weird thing is when i take the dual adapter out of the soundcard and just put in the engineer headphones u can hear both sides. i dunno what the hell is going on