Question

in post fade on auxes when ch send is set at full on (all LEDs lit) does it equate to Unity(0) or +10 like the fader

Answer 1

There is no information in the manuals about this theme. It looks like that the aux sends end at "full" = 100 %. I don't own a SL AI board any more, so I can't check it. I f you want to get a precise answer, contact support / open a ticket in your account.