Electro Harmonix Pico Swello

Effect Pedal for Electric Guitar

Changes the attack of the guitar to achieve a soft and flowing sound even when playing fast runs and arpeggios
A stronger effect produces dramatic swells in volume, which are perfect for ambient soundscapes and synth pads.
Compacy pico housing
Controls: Vol, Attack, Freq, Mod
Push button: Filter
LED: Effect on
Footswitch: Effect bypass
Input: 6.3 mm jack
Output: 6.3 mm jack
Power adapter connection: Barrel connector 5.5 x 2.1 mm, centre negative
Power supply with a 9 V DC mains adapter (included)
Dimensions: (W x D x H): 51 x 93 x 51 mm
Weight: 544 g

Note: Battery operation is not supported.

30-Day Money-Back Guarantee

3-Year Thomann Warranty

Available since October 2025
Item number 626652
Sales Unit 1 piece(s)
Effect Types Auto Swell

€135

All prices incl. VAT

Sales Rank

in Miscellaneous Guitar Effects

Information on the disposal of old devices

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4.1 / 5

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7 Reviews

Ouitstanding attack 'removal' pedal

Nadim Bakhshov 04.11.2025

The Pico Swello replaces my old EX Attack Delay, and it’s a major improvement. The polyphonic mode on the Attack Delay always left artefacts and slightly altered the tone — sometimes adding a metallic edge that became distracting. The Pico Swello has none of these issues. It tracks cleanly and responds quickly, so even fast guitar passages are smoothed without glitching. The effect is genuinely impressive: it can turn your guitar into something that feels almost like a bowed instrument, giving you violin-like swells or a fluid, steel-string texture with ease

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Inspiring and easy to use

Theokryps 11.12.2025

Very inspiring pedal, doing well what it's supposed to! Slow attacks, very useful for ambient swells and good tracking for faster playing. It really helps to extend guitar playing possibilities.
I would prefer an even slower attack time. Also, when the filter is off there is still some colorization of the tone.

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Pequeño pero robusto

l''' 11.12.2025

El pedal tiene un sonido increible, tal vez para algunos sea extremadamente pequeño. el único problema que tuve es que el adaptador de 9V produce ruidos y es imposible de usar.

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toller Effekt

Wafthrudnir 03.12.2025

Habe auch den Attack/Decay von EHX, den ich oft benütze weil ich dieses cellohafte sehr mag, macht auch in dezenten Einstellungen den Ton sehr weich und etwas ungewöhnlich. Das Pico Swello hat zwar weniger Einstellmöglichkeiten, klingt aber für meine Ohren besser als das Attack/Decay, da es den Ton nicht so stark verfälscht. Das Tracking ist auch sehr gut und der Platzbedarf sehr klein, und das zu einem Superpreis.

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Electro Harmonix Pico Swello

Effect Pedal for Electric Guitar

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Electro Harmonix Pico Swello

Effect Pedal for Electric Guitar

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