Electro Harmonix Metal Muff with Top Boost. Top Boost adds serious bite with its own control knob and footswitch button. The Metal Muff is a respectably large pedal with six pots – Volume, Top Boost, Treble, Mid, Bass and Distortion – and two footswitches. The Top Boost function just makes the sound more papery, and the pedal sounds awful when paired with a Telecaster, and only acceptable with an SG equipped with P-90s. by TMNtv (2013-08-02) Electro Harmonix Metal Muff with Top Boost Review - BestGuitarEffects.com by bestguitarfx (2014-04-27) Electro-Harmonix Metal Muff by KytaryCZ The responsive 3 band EQ allows you to sculpt your tone whichever way you want and the top boost can be kicked in to give awesome presence to your lead lines. (2013-04-14) Electro Harmonix - Metal Muff w/top boost (Demo) by MartinMoyan0 (2013-07-19) EHX Metal Muff Top Boost Distortion Guitar Pedal Review - GearUP on TMNtv ! A heavy metal pedal for heavy metal guitarists, our Electro-Harmonix Metal Muff review explores why this pedal is a serious player on the distortion scene. The Electro-Harmonix Metal Muff with Top Boost features 3 powerful EQ bands that are ideal for sculpting mids and a total of 6 controls for shaping sound precisely your way. A Gibson Flying V with high-output humbuckers turned into bass mush with the Metal Muff, and the Top Boost only added a tinny edge, not true body or cut to the overall tone. Built with the classic Big Muff circuitry and designed for the most extreme of playing, the Metal Muff Distortion with Top Boost capable of the most aggressive effects demanded in metal. Three powerful EQ bands sculpt the mids and 6 controls shape the sound precisely for your groove from slithering mercury to lead belly blast furnace dross. The left switch kicks in a variable top boost, though only in effect mode, not in bypass. The Electro-Harmonix Metal Muff Distortion with Top Boost is the ultimate metal distortion pedal. Battery included, Power Supply available; Video Demo The switch on the right either turns the effect on or bypasses the circuit completely.