I record a podcast and I recently got the behringer xenyx x1222usb to record myself and some friends. I plug the board into my PC, using Adobe Audition. Sometimes, I'd like to play some audio from the computer I'm using to record back into the board. (Example: A Youtube video playing from the computer that's recording live, as me and my cohosts do commentary over it) When I try to do this, there doesn't seem any volume control on the mixer. Is there any way to control the volume from the board? Or are my laptop's onboard audio controls the only way? Also, it seems Audition does not pick up the audio coming from my computer. Do I have to press something on the mixer for it to record the audio coming back in. Is this even possible? Thanks!