Well I finally played my first gig in maybe 15 years. It was a rather large crowd of 1200. In the rush of getting ready for sound check, the stage manager was shown the balanced out on my Ampeg. I just said "do whatever you need with the ground lift". I had set the pre / post switch to post out of course. No big deal, but I wanted my very light compression and maximizer in the mix. After the gig, I checked the switch, and (of course) he had punched the button to the "pre out". No matter as I was told (my knowledgable friends) the notes were clean and clear in the house. The other band that night had full range sonic MUD on the bottom all night. But they had their own sound guy on the same board as we used, the difference being we used the house board man. What a difference a good sound man makes!