Headphone doesn't work in Cross DJ LE for Mac

My headphone doesn't work. After searching the internet for hours and hours and watching tutorials with advice to set my presets otherwise in preferences->audio but than finding out that the standards they put it on are not visable in my presets. Then I found a topic that states that the headphone doesn't work in the free version. So I tought that was it; I need to upgrade. However I have 'Cross DJ LE' and I think that has the same functions as the paid version of Cross DJ (and is not the same as Cross DJ Free). Does anyone now that?
Can someone please tell me how I can make my headphone work? After reading all the topics about this (unfortunately there are more people like me with this problem I have noticed..)
Can someone please tell me how I can make my headphone work? After reading all the topics about this (unfortunately there are more people like me with this problem I have noticed..)