Going thru some of these steps after checking the flying busboard connectors themselves ... all the ones I checked seemed to register +12, -12, and +5 appropriately. Now checking independent modules but bear in mind that the buzzing noise would become present regardless of which modules I chose. It seems to be more related to whenever more than about 10% power is being drawn on the 12v rail or 20-ish% on the negative rail, so far I’ve been unable to link to it a particular module but been able to replicate the buzzing w a variety of different modules, once there are enough of them. Nothing is drawing on 5 at all which someone suggested to me could be part of the issue since it’s a Meanwell psu and they have some issues if nothing is drawing on 5 i guess. But i dunno what i’d do about that —- I have no plans for any modules that would draw on the 5 at present.
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Got it.