So I recently bought a Behringer Eurorack UB502 to play along with some recorded tunes. What I'm finding is when I plug my ipod into the mixer and then listen to my headphones, songs that have have a different track being played through each headphone side, aren't coming through. Only one side is coming through both speakers. For example, one song has a solo that comes through the right speaker only on my headphones. When I plug it into the mixer, I don't hear the solo at all, only the stuff that would come through the left speaker normally. This is hard to explain, but hopefully someone can help me.