If you ever find yourself in the middle of the set and you open your eyes to find yourself levitating off the ground, flip this switch and it will help keep you from floating.
on the serious side--Sometimes you will get noise from a wall outlet sounding like a hum or a buzz. If you hear this abnormally flip the ground switch to one of the 3 positions(if I remember correctly) and it might make the noise go away by grounding the chassis of the amp. No tonal change but it might come in handy @ one point. My 1996 Tremoverb had a Ground Switch and I hardly ever used it--but my newer 3 channel Triple Rec doesnt--The newer ones didnt have one for some reason-- :wink:
