Electro Harmonix Pico Swello Attack Filter Pedal

The Electro-Harmonix PICO Swello brings expressive, polyphonic volume swell effects to a compact pedalboard-friendly format. Its unique attack envelope applies individually to each note, even when playing chords, creating smooth, musical swells that respond naturally to everything from fast guitar lines and arpeggios to ambient textures and synth-style pads.

Polyphonic Swell Effects

The PICO Swello’s attack envelope creates a smooth, flowing response by shaping the attack of each individual note. Subtle settings soften the attack of fast lines and arpeggios, while longer attack times create dramatic swells suited to ambient guitar, atmospheric soundscapes, and evolving pads.

Expressive Low-Pass Filter

A built-in modulated low-pass filter adds another layer of tonal control. The FILTER button engages the filter and provides selectable resonance settings, while the FREQ knob adjusts the cutoff frequency. The MOD control determines the depth and direction of the filter envelope, allowing upward or downward filter sweeps. Filter modulation timing follows the ATTACK setting for cohesive, musical results.

Simple Four-Knob Control

The compact control layout makes it easy to shape the effect. ATTACK controls the envelope time, VOL adjusts overall output level, and the filter controls provide additional tonal shaping. The PICO Swello fits easily into a pedalboard while offering a wide range of expressive sound-design possibilities.

Specifications

• Effect type: Polyphonic attack envelope and low-pass filter
• Chassis: Compact PICO Series
• ATTACK control: Adjusts attack envelope time
• VOL control: Adjusts overall output volume
• FILTER button: Engages low-pass filter and selects resonance settings
• FREQ control: Adjusts low-pass filter cutoff frequency
• MOD control: Adjusts depth and direction of filter modulation
• Polyphonic operation: Applies the swell effect independently to individual notes
• Filter modulation timing: Tied to ATTACK setting
• Power adapter: Included

A compact and versatile pedal for guitarists seeking smooth note-by-note swells, dramatic ambient textures, reverse-style effects, and expressive filter movement.