Basicly it is a summing device so let it sum.
You have 10 analog output. Leave the 1/2 for monitoring. Connect the ouputs 3...10 to the summing device.
Your control software goes in daw mode.
In your daw make 8 stereo outputs next to your main stereo bus.
Grab your drum tracks and mix them as stereo to output 3/4 ---> summer.
Grab the rest and break them up in vocal parts, basses, keys ect.
Assign them to 5/6 7/8 9/10
For me ( example) link vox tracks to the summer. If vocals are a bit soft i will not overdrive the daw but i press the +6 button to lift the vocal tracks. This way oyou got more headroom.....
If possible route the main of the dangerous back to the daw so you can record the results.