I will try this today. Adding 18pF between the hot and shielding.
I forgot to mention that I also connected the Aviom AN-16/o ooutputs to another input on the AR2412 rack. I used the RTA tool to sweep a sine trough the aux output and back into the mixer. I saw harmonics being created when the sine frequency was abode 1K.
I’m looking for someone with an AN-16/i to see if the output module is defect, or if it is a GLD “Bug”. No luck finding someone yet…
GLD all the way 
