Electro Harmonix Pico Swello Attack Envelope Pedal

Electro-Harmonix's polyphonic attack envelope filter, now in compact Pico form. The PICO Swello generates smooth, expressive swells and reverse sounds by applying attack envelopes to each note—perfect for everything from flowing fast lines to dramatic ambient pads. Four intuitive knobs control the core effect: ATTACK shapes your tone from quick, gentle attacks to slow, long swells. VOL compensates for perceived volume loss with extended attack times. The integrated Low-Pass Filter adds musicality with adjustable resonance, cutoff frequency (FREQ), and modulation depth (MOD). Engage the filter to create upward or downward sweeps synchronized to your attack setting. Subtle implementation smooths fast arpeggios and passages. Heavy use crafts synth-style pads and shifting ambient textures. Adaptive to any musical style, the PICO Swello brings the beloved POG2 attack filter into a pedalboard-friendly format.

• Compact Pico chassis
• Attack Envelope effect of the EHX POG2
• Polyphonic attack envelope applies swell to each individual note played
• VOL adjusts overall output volume
• ATTACK adjusts ATTACK Envelope Time
• Low Pass Filter with adjustable resonance and envelope modulation
• FILTER button engages LPF and selects resonance settings
• FREQ sets cutoff frequency of LPF
• MOD controls depth and direction of filter modulation
• Power adapter included