Add Headphone jack to cdjs

When playing back to back sets with other djs, it would be so amazing to have a headphone jack in the cdj, so i could get mixes going on the sides without having to take over the mixer cues. Some use headphone splitters and fumble over each other dealing with chords and arms etc.plugging into a deck and mixing away and tapping your partner to mix it or move over or whatever would be so insane.