Can anyone tell me why my 57 isn't recognizing the crossfader??? With the crossfader closed and playing music on the right deck I can still hear the right deck! WTF? Same goes for then the fader is closed and I play music on the left deck. I have the lines set up properly on the back of the mixer. Channels 1 & 3 are set to phono an 2 and 4 are set to line. The decks are plugged into 1 & 3.... Please help! Got a gig in 2 hours. Thanks