A classic overdrive circuit with modern modifications for improved performance and versatility. 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. Tone, tone, tone, and more tone. That is what guitar players strive for, the perfect, and somewhat elusive killer tone. The MXR Custom Badass Modified Overdrive works great with slightly overdriving a clean amp, or sending an overdriven amp over the edge!