The plugs in my house all have three holes, but i found out recently that the ground holes are empty! So my house actually has no ground! I think this is why my bass amp is producing the 60-cycle hum. I've read a little bit about it but I'm pretty much in the dark here. How could I fix this? I was looking at the ART Cleanbox or similar, and I'm really not sure if that would help me... Ground loops is one thing, but to have no ground.. i don't know! Please help.