Just got a Avantone Mixcube for Christmas and would like to know if anyone knows how you go about hooking one up to monitor with it in mono. I just have one but really have no idea on how to go about hooking it up. Was looking into getting a Mackie Big Knob to switch back and forth from my mains to this one. But it only has a single input for a cable. Do I need something like the Whirlwind IMP Combiner or is there something else I can use to sum the Left and Right together? I am using a Focusrite 18i20 second gen. 
 

Sum in the DAW by setting the interleave on a bus to mono. Should only need to take the signal from one hardware output to the monitor.

So just by clicking the stereo symbol to mono will do it?