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Yeah, just to confirm -- after further testing it seems very much to me that it isn't linked to a specific module. At one point I thought I'd isolated it to the 4MS PEG, because when I turned off the "cycle" buttons, the buzzing stopped. But further experimenting and swapping of modules made it clear that the reason it stopped was simply because the power draw of having the LED buttons in the "lit up" state on that module were pushing the overall load above whatever exact threshold it is where the buzzing starts. I was able to take out a module or two and then operate those buttons w/ no noise issue, or remove that module and still replicate the buzzing if enough other modules were added. But again the issue is that the power draw of my modules is nowhere near the specs of what the PSU should be supplying, I'm below 25% load on both +12 and -12.