The Electro Harmonix Blurst Modulating Filter turns its inspiration from keyboard and modular synthesizers into a versatile modulating filter pedal. The Blurst delivers an envelope filter effect that is controlled by an internal oscillator, for a variety of creative tones, ideal for funk.
 
Equipped with an analog, low pass filter with adjustable resonance, three modulation waveform shapes, tap tempo with tap divide and EXP control over range, rate or filter. With all these versatile control options, the Blurst Modulating Filter is the perfect choice for creative guitarists who want access to unique filtered tones.
The Blurst Modulating Filter combines technology often found in keyboards and modular synthesizers, into a compact pedal. Designed with the guitarist and bassist in mind, the Blurst modulates an effect similar to an envelope filter, which is controlled by an internal oscillator rather than by playing dynamics. This oscillator is the core of the pedal's tone and lets you access a plethora of modulation sounds, all with EHX's reliable build quality ensuring it will never let you down.
Unlike other modulating filter pedals, the Blurst's all-analog signal path features a fourth-order low pass filter with variable resonance. Players can achieve basic modulation with a choice of three wave shapes including Triangle, Rising Saw-Tooth and Falling Saw-Tooth. The modulation is controlled digitally, allowing for tap-tempo, and an additional expression pedal (sold separately) can be used to control three selectable parameters. The Blurst is a great tool for the experimental player who wants a distinctive sound.
Achieve envelope filter tones controlled by an internal oscillator
Analog low pass filter with adjustable resonance
Three modulation waveform shapes: triangle, rising saw-tooth and falling saw-tooth
Modulation rate is set by either the rate knob or a combination of the tap footswitch and tap divide toggle switch offering quarter, dotted eighth and triplet rhythms
Three EXP modes, range, rate and filter, can be controlled by an expression pedal or control voltage source like EHX’s 8 Step Program Analog Expression/CV Sequencer
Range knob sets the frequency range of the filter’s modulation, Blend control adjusts the dry/filtered signal mix
Includes an EHX 9.6DC200mA power supply