Used Electro-Harmonix Knockout Attack EQ Pedal. With the Knockout Attack Equalizer, Electro-Harmonix packs an amazingly powerful two-filter combination into a stompbox that makes your humbuckers sound like single coils and your Strat sound like a Tele. Place it post-distortion for the heavyweight punch of the metal masters. Knockout is also an awesome add-on to your bass effects rig! The operation is simple with a lowpass filter, a highpass filter, and a dry knob that controls the volume of the dry signal coming from the input jack. Add some punch to your sound with Knockout!