(I suspect this arrangement causes some vertical phase delay of the 12x12 outputs compared to the other genlocked sources in our system, as ATEM PGM out is probably not phased too closely to the system reference.) We did a couple of international sports OBs this way and got away with it, with no observed issues. So to use it as a "box of synchronisers", we have to feed ATEM program SDI output into the 12x12 input 1, to provide a synch reference. I was surprised to find that our 12x12 appears to effectively genlock its outputs to follow the synch of its first (SDI) input and NOT that of the reference input provided (PAL analog black, in our case), which appears to have no genlocking effect, whether or not it's plugged into the 12x12.
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