I've used the 5th gen. unit for about two years and at least 6 different amp set ups, different guitars and such. The noise goes away when the unit is engaged. It is not a new issue, just something I want to take care of properly, hoping that someone here had the same issue with one of their pedals and found a solution. Is it an internal ground issue? Probably, but I don't know for fact. The wall wart is two prong. I've tried every conditioner I have.
Listening to the newest Korn and Dimebag got me inspired to put it back in the line, I'm loving it. I forgot how a ten second burst with the harmonizer in the middle of a solo makes some fans eyes bug-out. Brendan Small, the creator of Metalocalypse (Dethklok), used it so well in the theme, I went and bought one. Before that, I was like, "how the fuck does Dimebag do that?"
It was a year at least before I learned Van Halen used both hands. I was in tenth grade and we didn't have MTV, at my house, we had one TV, I had 5 sisters, no TV for me, guitar only. (No Black Sabbath, Hendrix or especially Steppinwolf's, "The Pusher" allowed at my house, seriously!) Nobody knew wtf EVH was doing in Eruption. We were told about it, (he uses two hands? huh? doesn't everyone?) but still, we were mystified until we were seeing it with our own two eyes, then it made sense.