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How good is this forum guys!
I had an answer while I was still at the gig!
Many thanks for those answers.
Just incidentally, I also had a strange buzz that came and went over the
Main front of house system.
I was attempting to isolate the problem and noticed a massive buzz whenever the ace link cable was connected between surface and mix rack and also when my r72 surface
Was connected to certain power supply sockets.
I did not think it was possible to get an earth buzz on this system.
It’s probably part of the cable QOS thing.
Bad power in the venue maybe.

R72 & IDR32
MacBook pro
iPad 2
Airport express router