Combining a lowpass filter, low frequency oscillator, and trove of tweakable onboard parameters, the Electro-Harmonix Blurst Modulated Filter Pedal turns a guitar or bass into a new sonic landscape. Controlled by the internal oscillator, the Blurst lets you choose between three wave and tap tempo functionality to create a world of dramatic, experimental filter sweeps. A unique effect that stands well on its own and works wonders bringing out new sounds from what's already on your pedalboard.