Just some thoughts.
You can’t be serious. Wouldn’t that not only destroy all my gear but make me deaf? Are you serious? I asssume I’d be using a surge protector.
I am serious, and no, doing this won’t “destroy all your gear” or make you deaf.
Hmm… That’s bizarre. Are the outputs of the 2880 going into any other effect pedals? Or may be try returning everything to unity. The pans – back to center position, the “dry out” faders, track faders, and “mix down” faders – bring all the way up. Then readjust the gain input for the instrument. If it’s still louder through the outputs, try seeing if the same thing happens using the headphone output.
Just some thoughts.