Stereo Cables Not Consistently Delivering Stereo Sound via Headphone Port

[Lonman]

If you are using headphone jack to get the sound from the computer to mixer, id highly urge you to not use it any longer and invest in a decent external USB sound interface (if your mixer doesnt already have one built in - some of the newer ones do). It will open up the sound like going from a 10 watt light bulb in a room and replaced with a 100 watt light bulb in that same room.