Sound isn't coming out of the left side of my headphones

[clarkdprice]

This is driving me crazy, when cueing I can't seem to figure out why sound isn't coming out the left side. I've tried the headphones outside of traktor and they work fine so I don't think its the headphones.

here are screens of my settings. Thanks

[daemcee]

Are you using an external soundcard? Or are you just using your computer? The more information the better

[clarkdprice]

Are you using an external soundcard? Or are you just using your computer? The more information the better

No external soundcard, just my computer.

[daemcee]

how many audio port do your computer have? because one is for speakers and other is for headphones

[clarkdprice]

how many audio port do your computer have? because one is for speakers and other is for headphones

Its plugged into my Macbook Pro via USB, I never have had to do anything else. The sound was working last week when I played a party. It just started happening recently, thats why I thought that maybe putting up screens of my settings would help. I figured maybe a setting somehow got changed or something. I'm gonna try and replace the adapter I'm using that allows me to plug my headphones into the S2. I'm not sure what else to do :/