The Durham Electronics Zia Drive Overdrive Pedal might very well be the perfect rhythm guitar overdrive pedal. If you hate the feeling of sag in your fingers this is the box for you. It takes your 6L6 or 6V6 amp and gives it the chime of an EL84. If you have an EL84 amp it will boost that bottom end and make it sing at lower levels. Early 70's Stones fans and fans of chunky riffs will love the ZIA!!