Show Cue System

Hi I have done all My editing, 6 channels surround with internal mixer on. I'm using a Mbox 3 Pro external soundcard 6 ch out. But I'm getting stuttering sound now and then so I changed to NO internal mixer but now i can't get output 3 to 6 to work only 1-2, L-R. When I start the test tone it will o...

I´m using SCS Standard, what I can see I only have 2 outputs from my Mbox 3 in SCS and my 5.1 mix is not an 5.1 audio file becuse I can´t downmix in surround in Pro Tools 9. So I have to bounce every output to 6 mono files.

But if I go Pro I shuld get 6 outputs from my Mbox right?

I want to mix some sound in surround 5.1, I´m useing a Mbox 3 Pro with 6 outputs.
Do I need to upgrade to PRO user to do that and how do I set the outputs in the production properties?