No vox controller or co pilot sound

I had vox working earlier. I have headphones and got a usb sound card so that the atc goes into my headphones. Now upon restarting vox i cant hear any voices at all! The vox menu comes up and if i transmit I see it moves on to the next message but I am not hearing any voices. I do hear the sounds of the plane on my external speakers. Any thoughts on how to fix this? Vox has been a real pain to try to setup so far.