Here for sale Carl Martin Heavy Drive electric guitar FX pedal. PLEASE NOTE: the led don't light up when the pedal is on, otherwise it works fine. The Carl Martin Heavy Drive offers the player the most gain and is voiced with emphasis on the lows. This makes it the perfect choice for getting that "heavy rock" sound. By tweaking the mid and high EQ settings via the unit’s attack and edge controls, many tonal variations can be served up effortlessly. Features true bypass. It's in good condition and comes as pictured.