The Lehle P-split is the ultimate tool to get rid of all hums and noises. Apocalyptica uses P-split to split their signals to 2 channels, amp-channel and effect channel. It is superhandy because it ´s passive and has a groudlift. The Lehle P-split has saved us so many times when we had humming difficulties. Apocalyptica warmly recommends Lehle P-split to all professionals and even to hippies!