Electro-Harmonix Pico Swello Attack Envelope Guitar Pedal

The Electro-Harmonix Pico Swello Attack Envelope Guitar Pedal brings the beloved attack filter effect from the legendary POG2 into EHXs ultra-compact Pico chassis. Known for its polyphonic attack envelope, the Pico Swello applies expressive swells to every note you playwhether single notes or full chordsdelivering smooth, violin-like textures or dramatic synth-style soundscapes. With the addition of a resonant low-pass filter and modulation control, this pedal opens up a new world of dynamic, evolving tones for guitarists and bassists.

Subtle settings allow you to smooth out fast lead runs and arpeggios, while deeper attack times create ambient pads and lush, swelling effects. A simple yet powerful 4-knob layout makes sound shaping effortless: ATTACK adjusts the swell speed, VOL balances output, FREQ controls the LPF cutoff, and MOD sets the depth and direction of filter modulation. The Filter button engages the LPF with selectable resonance, tying the filters timing directly to your attack settings. Compact, expressive, and stage-ready, the Pico Swello is an inspiring creative tool for modern players.

Features

• Compact Pico chassis for pedalboard-friendly design
• Polyphonic attack envelope effect derived from the iconic EHX POG2
• Applies expressive swells to each individual note or chord
• Sculpt smooth, flowing leads, arpeggios, ambient textures, or synth-like pads
• 4-knob layout with Volume, Attack, Frequency, and Modulation controls
• Low-pass filter with selectable resonance and modulation depth/direction
• Filter timing synced to Attack knob for seamless expression
• Buffered bypass ensures signal integrity
• Durable build quality, perfect for stage, studio, or practice
• Includes 9V DC power adapter for immediate use

Specs

• Pedal Type: Attack Envelope / Filter Effect
• Analog/Digital: Digital
• Controls: Volume, Attack, Frequency, Mod; Filter Button
• Inputs: 1 x 1/4″
• Outputs: 1 x 1/4″
• Bypass Switching: Buffered Bypass
• Power Source: 9V DC power supply (included)
• Power Usage: 100mA
• Dimensions (H x W x D): 2.0″ x 3.65″ x 2.0″