Currently, I have two Pittsburgh Modular Structure EP-208 cases but when maxed-out with modules they start to give off some noise.
-- morphon

what exactly do you mean by maxed-out - how close to the maximum are you on the power rails?

if you reduce the power draw - take out the most power hungry do you still have the problem?

maybe it's just time for another case and put a few lower power or passive modules in these cases to fill them up

otherwise Mantises have quiet and clean power (clean up to video rate)

"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia

Utility modules are the dull polish that makes the shiny modules actually shine!!!

sound sources < sound modifiers < modulation sources < utilities