Finally, the MXR Bass Distortion's raunchy sound comes in two flavors, 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. • Co-designed with bass dirt guru/Fuzzrocious Pedals founder Ryan Ratajski • Based on a classic distortion circuit famous for its nasty sound • Separate Dry and Wet level controls • Select between Silicon and LED clipping diodes • Internal control sets the max gain level of LED mode • Get the sound of a split clean/dirty signal chain in a single box