If you haven't seen the sonic trainwreck that was "Jump" at the VH show in Greensboro, check this link out. If you have seen it, the link also has a great "roundtable" with a variety of musicians/techs, including Lonnie Totman, Ed's former guitar tech, dissecting the problem...although they don't agree on the cause....worth the watch/read. "Fair warning", this ain't pretty: Jump Meltdown and Analysis