Nexus 900 recording into Mac without vocal

you can record out of the booth pout and in the club settings of the mixer, turn off the mic for booth

Ni there Bri, thanks for the quick response. 

I think I get that but my current set up is Pioneer out on main by XLR's to a focusrite sound card. Then from SC to Mac Mini, then to Encoder out to net. I want to go USB out to separate Macbook and record on the macbook with Audacity. But when I set it up for that, you still hear the Mic. 

How do you access club settings? I have never done that! 

I think I got it now, I can swap and go from USB out and straight into to the mac mini for the main show. I can then use the booth on the 900 and out the focusrite, then from the focusrite to the macbook for the recording with mic switched to off in club settings.

That right? :)

I believe you get into them by holding down the utility button as you power the mixer on

But that is only for the BOOTH output. There is no option to disable it for the REC output. What you CAN do is actually multi-track your recording by sending each of the channels to the software and recording all of them, then flattening it out after. That way you get each channel as a discrete recording and no mic.