Problems with PFL

Hi everyone. I´ve got a firstmix pro usb DJ controller, and mixvibes Cross DJ LE 2.4.0 as software. All time i try to prelisten the sound doesn´t come out of the headphones. I tried to set the mappings.
Can somebody help me?
Also the scratching doesn´t work exactly, but i´ve heard there is a solution for it, can somebody help me with this problem too?
Best regards
Can somebody help me?
Also the scratching doesn´t work exactly, but i´ve heard there is a solution for it, can somebody help me with this problem too?
Best regards