Hello Bob!
I actually have most of the equipment you said minus the Gen 10,that i really want to buy.I plugged the deck to a mixer with xlr cables,but there isn’t any sound coming from it either.No audio degraded or distorted.Tried the IO HD to the mixer with xlr and it has sound coming from the laptop.I was using the deck headphone out put just because it was easier.As i said there is audio coming into the deck because the level bars are moving and i can hear from speakers or headphones.
I know how to select the inputs for the deck,it is all selected for the SDI input and the output was for the headphones and,later,for the xlr outputs.If the problem is the lack of video ref,i’ll be more than glad to donate my blood.
Always learning….