You DI really great work. As an audio engineer in live sound I can tell you if I see an xlr direct output that does. It have a ground lift switch for pin 1 I do NOT use it. Manufacturers of music equipment seem to have no idea of how ground loops work. Google "the pin 1 problem" and also check out the synaudcon and papers by Bill Whitlock and Don Pearson in regards to grounding and the pin 1 problem. Basically electrical and audio grounds should be isolated from one another. Good luck. Maybe you will be the first to put a pin 1 lift switch at the output of your amp!