nux horseman overdrive guitar effect pedal with gold and silver modes nux one of the most sought-after dual overdrive pedals produced in the mid '90s is now in one unique pedal design-with a pocket size. nux horseman pays homage to the legendary centaur pedal. there are 3 dials for primary settings and 2 modes: gold and silver, and it offers massive headway usually requiring an 18v input. gold mode mimics its classic predecessor; the transparent gold centaur overdrive pedal and the silver mode is a powered-up version with an extended gain range (silver centaur).