Thanks for the reply. I have slim ADAT connectors and they clip in to the ADAT ports on the back on the H8000FW. I can recieve ADAT signals from the Eventide but it doesn't seem to accept them. Like I said, the input LEDs don't light up.
I checked the clock and it says that ADAT is 'unlocked'. I upgraded the production software on the Evenitde but still have the same problem.
Sorry, I'm probably missing something obvious…