Also is it normal for a mixwizzard one to make obnoxious noise when you engage the global phantom?
I seem to remember that phantom power pops, even with the channels muted, was a complaint of the early MizWizes. Do you get noise just plugging in a condenser, even if phantom power is already on?
The only other issue I can think of is the ground connections on the faders are not 100% solid, often causing the faders to only attenuate by 10% or so, at the bottom of their travel. A few minutes with a soldering iron can cure that one.