Get the sound that made the Classic 1970 Small Stone famous. Generates thick sweeping phase shifting with liquid transparency. Feedback color control adds a tingling swirl. Blues players dig the Stone?s rapid rotating speaker effect. Country players add tasty seasoning to their chicken pickin?. Metal-heads dig its jet plane swoosh.True bypass Variable rate control allows slow and smooth to rapid edge frequency sweeps Color switch adds Q and thins the moving comb filters Tough and compact die-cast chassis 9-volt battery included