General idea is the same as with few sources. Genlock sync signal is reference for everybody connected to it. Different question is what devices should you use. Frames should be in sync if from cameras as they feed realtime picture. VTR’s on other hand are controlled by some sort of controller that plays the exact frame that any other player controlled by this controller.
This is how i have get it. Maybe i’m mistaken and get some beating from Bob but thats ok for me 🙂
If from anyone, then he is the guy you will want to get beating from if you want to know anything
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Margus
https://iconstudios.eu