Rocktron's Reaction pedals feature metal enclosures built to absorb maximum punishment while taking up minimal pedalboard space and include True Bypass switching. 

An autofilter effect that triggers harmonic phase shifting based around your pick attack, the Reaction Dynamic filter is a great pedal for adding a funky edge to both guitar and bass. Features a switchable Distortion circuit, a Sensitivity control that determines how much your playing affects the pedal, and a Level control to adjust the overall output.