Filtering effect pedal for electric bass guitar that uses two identical filters sweeping in opposite directions – one up in frequency, one down in frequency – to give classic 70's-inspired funk sounds or completely new and original filter tones. Two filters sweeping at the same time provide a more organic, vocal quality and allow user to get expressive new sounds that cannot be delivered by other pedals. The pedal offers unique filter effects via an intuitive four-knob layout. The blend control allows user to adjust the mix between the filters. The threshold control determines how sensitive the unit is to different playing styles. The velocity controls determine the speed of each filter. The pedal also has a gig-saver bypass (signal passes even if the battery dies) and is powered by single nine-volt battery or optional universal power supply.