The BOSS XS-1 Poly Shifter packs cutting-edge performance into a compact pedal. Powered by advanced polyphonic pitch-shifting technology built on decades of expertise, the XS-1 is crafted for musicians who demand precision, flexibility, and ease of use.

From faultless octave jumps to subtle detuning, players can perform head-turning pitch effects while preserving their instrument’s natural feel and tone. Designed for effortless creative exploration, this versatile stompbox delivers instant capo functionality, drop tunings for heavy riffs, dramatic tonal shifts, and much more.

• Brand-new algorithm leverages ultra-fast attack, preserving clarity, technique, and instrument character and polyphonic pitching delivers stunning, glitch-free performance, even when playing full chords or fast melodic lines. Since it's a natural-sounding pitch shifter, it pairs well with other effects and fully supports bass frequencies.
• Natural pitch shifting with in a range of six octaves (three up to three down)
• Shift knob allows users to quickly select between 1-7 semitone or 1-3 octave intervals
• Detune mode adds depth and richness to your tones like doubling effect
• Shift Up function delivers convenient capo-style operation for changing key in a song or for tapping style performance
• The Balance knob allows quick, easy adjustment between the wet and dry signals
• The Shift knob provides effortless control over the pitch shift amount
• The Shift switch toggles the pitch between up, down, or slightly detuned (±20 cents)
• The Toggle/Moment switch selects between latching the effect on/off or activating it only while the onboard footswitch is pressed
• External footswitches allow to control over two different settings, so that you can control three different tunings in total
• Expression pedal allows to control the pitch shift in real- time like dynamic pitch bending effect