Big gnarly tones with all the low end your heart desires. MXR took a famously nasty sounding distortion circuit and re-tooled it for the modern working bass player. Back in the day, you had to split your clean and dirty signals between two amps. Now there’s no such need - this pedal puts control over the clean/dirty mix right at your feet with separate dry and wet level controls. The tone control, which only affects the distortion signal, is a simple high cut filter for dialing back the top end and the distortion control sets the distortion signal’s intensity. Finally, the raunchy sound comes in two flavours, selectable via the LED/SIL switch. The default SIL setting uses silicon clipping diodes for an aggressive, biting sound and a bit of compression, while the LED setting uses LED diodes for a more wide open sound and a nice gain bump. True hardwire bypass. Powered by 9 volt battery or AC adaptor.