My computer is off at the moment but here is a link to a screenshot I took earlier for another post, hopefully it works.
You can make out the Relayers showing data passing through while there is no audio heard:
https://community.gigperformer.com/t/first-live-gig-using-gp5/18164/18?u=justfornow
As already mentioned previously, my tracks do not go through the master output but to the same tracks numbers that were set up in the XR-18 mixer: channels 13, 14, 15, 16. The output from GP will go back to the same channels numbers to the mixer: 13 to16.