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Some manufacturers do provide separate banana jacks for signal ground (Manley Labs is one of them), and I'm about to modify my chain for transmission ground system, too.
But you're right in that some gear has terrible inner groundings. In my opinion, XLR pin 1 *always* goes to the chassis, the signal ground(s) go to one star ground point inside the chassis. Good folks also provide a way to disconnect the signal ground from the chassis and a way to bring it to a star ground point/bus of the entire system.
Grounding and Shielding Audio Devices
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Please,study the circuit!!!At such connection this device has two degrees of protection.The device case is grounding and shielding in one point.The switch samples only variant protection and instrument and people.Every day and every night the case is under ZERO POTENTIAL!!!!!Even if to turn out the earth in a power connector.It is very easy to accuse guys of war with Europa.I have studied all your documents and have not found any safety breakdowns.I trust the life to two systems of safety instead of one!!!!!!!!!!!!!!!!!!!!!!!!!!!