Dunlop MXR M77 Custom Modified Badass Overdrive Guitar Effects Pedal The MXR M77 Custom Modified Badass Overdrive Guitar Effects Pedal is a classic overdrive circuit with modern modifications for improved performance and versatility. For added flexibility, there's a 100HZ cut and boost control that allows for a more focused EQ when cut, or a beefier tone when boosted. The Bump switch engages an alternate EQ voicing that boosts the lows and mids. Put it in front of the '78 Custom Badass Distortion for a slew of amp-like gain structures that won't mask your tone. Features Classic overdrive circuit modded for improved performance and versatility 100HZ cut and boost control allows tonal fine-tuning BUMP switch engages alternate voicing for a low and mid-range boost