A hot-rodded classic circuit that roars with huge amp-stack tones and old-school distortion. The MXR Custom Badass ’78 Distortion roars with huge amp stack tones and old-school distortion. MXR took a classic distortion circuit and hot-rodded it to deliver over-the-top, soaring leads and rich, saturated rhythms. With only three knobs, dialing in a badass tone is a cinch. Engage the CRUNCH button to boost the harmonic content of the distortion. Under the hood, this high-performance machine features top-notch circuitry and hardware meant for a lifetime of use.