BOSS XS Series Poly Shifter

XS Series The New Standard in Pitch Shifting

State-of-the-Art Pedals for Pro-Level Pitching

The BOSS XS-100 and XS-1 Poly Shifters usher in an exciting new era of effects for electric guitar and bass. Powered by advanced BOSS algorithms, these next-generation polyphonic pitch shifters preserve your instrument’s natural tone while offering solid pitching and fluid control. The flagship XS-100 takes pitch shifting to new heights, empowering players to craft head-turning riffs and solos across an eight-octave range with ultra-smooth pedal action and deep customization options. The XS-1 compact pedal is loaded with the same pitch shifting algorithms, enabling maximum clarity and precision for instant retuning, drop tunings, capo effects, and octave leaps.

Pitch-Shifting Pioneers

BOSS has remained the epicenter of digital pitch shifting pedals since the 1980s. Having broken new ground with two world firsts, the DD-2 Digital Delay and RV-2 Digital Reverb, guitarists were treated to a compact pedal hat-trick when the PS-2 Digital Pitch Shifter/Delay was unveiled in 1987. Much like BOSS Chorus and Overdrive, Pitch Shifter endured as the effect category’s defining name, becoming a stompbox staple worldwide. Throughout decades of innovation, BOSS has stayed at the forefront of pitch shifting. Now, the XS series Poly Shifters set a new industry standard with flawless tracking, breathtaking sound, and capabilities not found elsewhere.

1982-2005

OC-2 Octave

1987-1994

PS-2 Digital Pitch Shifter/Delay

1994-1999

HR-2 Harmonist

1994-1999

PS-3 Digital Pitch Shifter/Delay

1999-2010

PS-5 SUPER Shifter

2003-2020

OC-3 SUPER Octave

2010-current

PS-6 Harmonist

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2020-current

OC-5 Octave

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2025-current

XS-1 Poly Shifter

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2025-current

XS-100 Poly Shifter

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BOSS XS Series

Elements of Pitch

Three elements are essential to high-quality pitch shifting: attack, clarity, and accuracy. The XS series Poly Shifters master all three, simultaneously providing exceptional latency, faithful sound, and perfect pitching. With pristine transients, articulate detail, and razor-sharp response, every note feels and sounds exactly as intended. The result is a pedal that fuels creativity and plays like an extension of the instrument, letting players perform solos, riffs, chords, and layered textures with unparalleled confidence.

Perform Without Limits

Perform Without Limits

Tone matters. Why? Because every nuance of your instrument shapes the music you create. Other pitch shifter pedals can erase years of carefully crafted tone, muddying riffs, solos, and layered textures. Pitch shifting is complex; tracking multiple notes instantly and accurately without coloring tone is notoriously difficult to get right. The XS series Poly Shifters solve this challenge. They retain your instrument’s character while delivering immaculate polyphonic pitching, allowing you to explore creative possibilities without compromise.

Designing the Future

Designing the Future

Perfecting the XS series meant rethinking pitch shifting from the ground up. BOSS created software capable of moving notes more naturally than ever, but the process demanded computer-level resources far beyond a traditional stompbox. Compressing that kind of muscle into a compact pedal proved a major hurdle. Countless trials with different DSP designs followed, until our engineers found the solution—a SHARC processor that works perfectly in tandem with our advanced algorithms.

Shifting the Standard

Shifting the Standard

Developing the XS series took years of refinement and pitch-shifting expertise. Powered by cutting-edge algorithms and a SHARC processor, these pedals execute complex polyphonic calculations with lightning speed for natural response and unmatched clarity across the full frequency spectrum. Every note sounds pure, every transient is preserved, and every performance feels alive. Together, the XS-100 and XS-1 set new benchmarks in pitch-shifting technology, combining expressive control with uncompromising sonic integrity.

If you want to speak, to actually control and throw and feel the waves of the pitch as you move it, then you need this.

Olly Steele

Ex. Monuments

Olly Steele Portrait
My favorite thing is that you can specifically set the pitch in increments of half step, single note movements, which provides a very smooth and consistent bend/expressive motion. I’m currently working on a new Night Verses record and so far, that has inspired me quite a bit.

Nick DePirro

Night Verses

Nick DePirro Portrait Nick DePirro
There’s a lot to unpack with XS-1, I currently use it as a lower octave blend. But the detuning options are out of this world and extremely accurate compared to other options I’ve tried.

Jon Jourdan

Mammoth

Jon Jourdan Portrait Jon Jourdan
I’ve been loving the XS-100, love that it tracks as well as it does and being able to pitch down cleaner tones has been a real treat for me. Overall it’s a very creative pedal because of the way it’s laid out, definitely something I want to have both in the studio and live

Rabea Massaad

Vower

Rabea Massaad Portrait Rabea Massaad
Designing the Future

Built for Performance

The XS series Poly Shifters keep your instrument’s tone intact, capturing every subtle detail. Designed to integrate easily with any setup, they put complete control at your feet. Straightforward to use and incredibly versatile, they give you exactly what you need, with the rock-solid BOSS build quality you can trust. Sharing the same advanced algorithms, the XS-100 and XS-1 take different approaches—from unrivaled dynamic pitch control to rapid retuning with the greatest of ease.

XS-100 Poly Shifter

Advanced pitch-shifting workstation with class-leading sound and feel.

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BOSS XS-100
BOSS XS-1

XS-1 Poly Shifter

Instantly retune your guitar or bass with class-leading sound and feel.

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Discover the Artistry of Our Global Community

Pitch Shifter Articles and Guides

How to Choose a Pitch Pedal

How to Choose a Pitch Pedal

A clear guide to the complete BOSS pitch range—learn how the XS-1, XS-100, OC-5, and PS-6 can reshape your sound and inspire new ideas.

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Reverberations: Olly Steele

Reverberations: Olly Steele

The London-based guitarist walks us through his history, the power of the XS-100 Poly Shifter, and how he'd explain his style to his granny.

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