No sound coming from the second track

Hey everyone,
I recently bought the U-Mix Control Pro.
Really great product, but I keep having the same problem.
Whatever the settings I make, I keep having no sound coming when I load a track on B...
I can see the track being read, i can mix it and everything, but i can't hear anything, meanwhile everything's normal with A
Can somebody explain me why or what I could do.
For the setting up of the Cross DJ and my control pro, I strictly followed the notice...
I recently bought the U-Mix Control Pro.
Really great product, but I keep having the same problem.
Whatever the settings I make, I keep having no sound coming when I load a track on B...
I can see the track being read, i can mix it and everything, but i can't hear anything, meanwhile everything's normal with A
Can somebody explain me why or what I could do.
For the setting up of the Cross DJ and my control pro, I strictly followed the notice...