I have a behringer 1204usb mixer and 2 computers and a microphone, I have both the computers output s plugged into the 5/6 and 7/8 stereo line ins on the mixer and I have headphones plugged into the headphone jack so I can hear sound from both computers, I then have the usb cable plugged into the pc I use for recording and skype calls and have the 5/6 and 7/8 going through the main mix which is that usb and all that works fine, however I have the microphone going through the alt 3-4 so I can separate microphone sounds from computer sounds for skype calls etc, the problem is I have a 1/4 to 3.5mm breakout cable going from the alt 3-4 to the mic input on the pc but it only gives me mono audio so the mic is only heard on 1 side, I was under the impression that the alt 3-4 was a left and right but I guess that isnt the case and they are both mono? Anyway just wondering if anyone knows what cable I need to get to make this work correctly? It does not need to be true stereo as its just the microphone as long as it plays through both L and R and also the mic pan on the mixer is set in the middle.