Firestudio Project aux output problem

Hey guys...first post here because I'm in need of a little help. I use a Presonus Firestudio Project with Pro Tools 11 and I'm trying to create headphone mixes to send out to my headphone distribution unit through the eight general purpose outputs on the back. My problem is that in Pro Tools I create my Aux track, set the input to Bus 3, set the output to DAW rt. 3, and then send the tracks I want in the mix to it but I still hear the main mix through the headphones. The general purpose outputs on the back are simply sending the main mix through them and not functioning as separate outputs that I can send things into. I know it is possible to use them as separate outputs and Presonus Tech support hasn't been very helpful. They said to look at Universal Control to make sure the monitor mix has been turned off for those outputs and it indeed has to which they then said to contact Avid because they didn't know. Any help you guys could give me would really, really be appreciated.



Thanks a lot for your time.



Nico