How do you connect a CD player with RCA jacks to the DM-24? I'm still very new to the mixer. I haven't had success with connecting the jacks to the "2TRK In". When connecting the RCA to a plug that combines the Left and Right signals into a single stereo plug, then connecting this to an auxillary in, I can only hear one side of the source. With a balanced input, shouldn't I be able to hear the stereo source?