Mixxx Assignment 4: Balance and Volume

I used the program called Mixxx. What I did was i played with balance and the volume the song called ''Tonight'' by John Legend. I learned how to change in which channel/ear(left or right) I want to hear the song. Also I learned that the headphones I'm using has two settings ''Mono'' and ''Stereo''. I don't know how a DJ can use this but let me know if you can, DJ's!