I played a gig the other night, and the sound guy told me to use another DI box because the DI on my head doesn't have a ground lift. I told him I don't own one, he got all agitated, and pulled one out of his milkcrate. I didn't know what that meant, so I did what he said. I looked at other heads, many have a ground lift button, I asked myself why doesn't mine? The manual says this: ""The output signal from this XLR socket is set to a level and impedance suitable for connecting directly into the Microphone input of a mixing desk for either Direct Injection into the PA system or for recording. This must ONLY be used into a Balanced Microphone input. It is not intended for any other type of connection. This has a floating ground that is referenced to the mixing console it is plugged into and should not need ground lifting. It is also unaffected by Phantom Powering on the Microphone input. Make sure your XLR plug does not have the shell of the plug internally connected to the ground signal or this will connect the system to the chassis ground of the amplifier and may cause problems with hum." Can someone help put this into layman's terms?