Description
The Electro Harmonix Blurst Modulated Filter takes classic synth-style filtering and drops it straight onto your pedalboard. Instead of reacting to your picking dynamics like a traditional envelope filter, Blurst uses an internal oscillator to sweep an analogue low pass filter, unlocking everything from subtle movement to wild, rhythmic filter sweeps for guitar and bass.
Perfect for experimental players, sound designers and anyone looking to push beyond standard wah and envelope tones, Blurst lets you dial in the shape, speed and range of your modulation, as well as blend in your dry signal for anything from gentle animation to full-on, chopped-up textures. With tap tempo, rhythmic subdivisions and expression or CV control, it is a powerful creative tool for both live performance and studio work.
Modulated Filter Magic
At the heart of Blurst is an analogue low pass filter with adjustable resonance, driven by an internal modulation source. Instead of your playing dynamics triggering the filter, an oscillator does the work, keeping your sweeps consistent and controllable. That means you can lock in hypnotic, synth-like movements that stay rock solid regardless of how hard you pick, ideal for tight grooves, electronic-inspired parts and repeatable studio tones.
Synth-style Waveforms and Rhythms
Blurst offers three modulation waveforms: triangle, rising saw-tooth and falling saw-tooth. The triangle wave gives smooth, even sweeps, while the saw-tooth shapes introduce more pronounced, edgy movement that really cuts through a mix. You can set the modulation rate with the front-panel knob or use the tap footswitch, then choose between quarter note, dotted eighth or triplet divisions for perfectly timed rhythmic pulses and syncopated filter patterns.
Expression and CV Control
Three dedicated EXP modes allow you to control range, rate or filter with an expression pedal or a control voltage source. Hooking Blurst up to a device like the EHX 8 Step Program opens up evolving sequences, stepped filter patterns and hands-free sweeps that respond in real time to your performance. Whether you are sculpting ambient soundscapes or glitchy, stuttering lines, the extra control makes Blurst a deeply expressive creative hub.
Blendable, Performance-ready Design
The Range knob lets you define exactly where in the frequency spectrum your filter moves, from subtle low-end wobble to bright, vocal sweeps. A Blend control mixes your dry and filtered signals, so you can keep your core tone intact while adding as much movement as you like. With buffered bypass and an included power adapter, Blurst is ready to drop straight onto your board and integrate seamlessly into a modern, mono pedal chain.
Key Features
Analogue Low Pass Filter with Resonance – The core of Blurst is a warm, musical analogue low pass filter with adjustable resonance, giving you everything from smooth, rounded sweeps to sharper, more pronounced peaks that can make your guitar or bass sound almost synthesiser-like.
Internal Oscillator with Three Waveforms – Instead of relying on your picking dynamics, Blurst uses an internal oscillator with triangle, rising saw-tooth and falling saw-tooth waves, so you can choose between smooth, symmetrical motion or more aggressive, directional filter sweeps.
Tap Tempo and Rhythmic Subdivisions – Set your modulation speed with the Rate knob or by tapping the dedicated footswitch, then use the tap divide toggle to select quarter, dotted eighth or triplet feels, keeping your filter movements locked tightly to the tempo of the song.
Expression and CV Control with Blend and Range – Three EXP modes let you control range, rate or filter via expression pedal or CV, while the Range and Blend controls fine-tune the sweep area and dry/filtered mix, making it easy to slot Blurst into any rig or musical context.
SpecificationsGeneral
Circuit: Analogue with digital control
Effect Type: Modulated low pass filter
Bypass: Buffered bypass
Audio: Mono
Controls
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