The Steel Leather from electro-harmonix provides your bass a sound that will punch through any mix. It enhances your picking and plucking of notes on the bass guitar, giving the notes a sharp attack that will easily cut through. Use the two knobs to adjust the amount of effect from subtle attack to a total emphasis of the attack. The louder you play, the more Steel Leather expands and emphasizes the attack. But on quiet notes, there may be no expansion at all. This means you can use Steel Leather to sharpen attacks simply by playing louder.