how to set up headphone mix logic pro x

When you do a send you can only select mono sends i.e. send 1 not send 1-2 also if you make an aux track you can only select mono no stereo i.e. 1,2,3,4 not 1-2, 3-4, 4-5. In setting up a headphone mix I set up a stereo aux then send signals to the left or right ear of the vocalist to there liking i.e. music in left ear and vocals in right ear. This has changed in Logic Pro X.

Thanks for your response.

Maybe this will help, in Logic Pro 9 there was a box under preferences/audio called universal track mode. If you unchecked this box then when settng a send or creating a aux track you had the ability to select mono or stereo busses. Logic Pro X doesn't seem to have this. So when creating a aux channel with output stereo 5-6 I can't select stereo thus I can't create sens to the left or right side of this aux channel for headphone mixes. In Logic Pro 9 I can create a stereo aux channel with bus 1-2 output 5-6 (to headphone amp) I can then use sends to send musical instrument to bus 1 (left side) and vocals to bus 2 (right side). I hope this helps I just want to know if this function is still in Logic Pro x or we have to go back to OLD SCHOOL way of doing this.

Thanks