One Pedal. Every Tuning You Need.
You know that moment mid-set when the singer says "let's drop it down a step"? Or when you want to try a baritone vibe but only brought one guitar? The Boss XS-1 Poly Shifter was built for exactly those situations — and a lot more. Stomp it on, dial in your shift, and you're there. No retuning, no swapping guitars, no drama.
This is Boss's first dedicated compact pitch-shifter pedal, and it draws on decades of Roland and Boss DSP research to do something earlier pitch shifters often couldn't: track chords cleanly. The XS-1 is fully polyphonic, meaning it can handle full chords, arpeggios, and quick melodic lines without glitching or smearing your tone. Whether you're shifting a half step down for a cover song or jumping a full octave for a synth-like texture, it stays musical and natural-feeling.
If you play guitar or bass in any context where tuning flexibility matters — cover gigs, session work, heavy music with multiple drop tunings, or just a love of sonic experimentation — the XS-1 is a genuinely useful tool to have on your board.
Pitch Range and Controls
The XS-1 covers a range of ±7 semitones or ±3 octaves in either direction. That's enough to simulate a capo, drop down to baritone or bass register, stack an octave for a 12-string effect, or go full synth-alien at the extremes. The rotary Shift knob selects your interval, and the Shift Direction switch picks whether you're going up or down. Simple and fast to set on the fly.
The Balance knob is where the real versatility lives. Blend your dry and shifted signals together and you open up a whole range of sounds: 12-string-style doubling, parallel guitar-and-bass layering, and everything in between. Turn it fully wet for clean retuning; blend it back for thicker, layered textures.
A dedicated Detune mode adds ±20 cents of pitch modulation — a subtle chorus-like shimmer that works especially well for doubling effects and adding width to a clean tone without obviously sounding like a pitch shifter at all.
Expression and Footswitch Control
The CTL/EXP jack on the XS-1 accepts either an expression pedal or an external footswitch, and the behavior changes depending on what you plug in. Connect a footswitch and you can recall up to three custom tuning setups on the fly — useful for live situations where you need to jump between multiple alternate tunings in the same set. Connect an expression pedal instead and you get real-time linear pitch control, letting you sweep pitch bends smoothly from your dry signal up or down to your set interval.
The Toggle/Momentary switch gives you the choice between latching operation (press to engage, press again to disengage) or momentary mode, where the effect is only active while you hold down the footswitch. That momentary mode opens up pitch-bending techniques that feel more expressive and hands-free than twisting a tuning peg ever could.
Analog-to-Digital Conversion and Bypass
Under the hood, the XS-1 uses 24-bit AD conversion enhanced by Boss and Roland's proprietary Adaptive Focus (AF) method, combined with 32-bit DA conversion at a 48 kHz sampling frequency. The AF method specifically improves the signal-to-noise ratio of the converters, which translates to cleaner, more detailed sound at every shift amount.
The bypass is buffered — meaning your signal is actively buffered even when the pedal is off, which helps maintain signal strength and high-end clarity across longer cable runs and larger pedalboards. Power is via 9V DC adapter or a single 9V alkaline battery.
Product Features:
- Polyphonic pitch shifting: handles chords, arpeggios, and single notes cleanly
- Shift range: ±7 semitones or ±3 octaves (up or down)
- Detune mode: ±20 cents of pitch modulation for chorus-like doubling effects
- Balance knob: blends dry and shifted signals for harmonies, 12-string effects, and parallel layering
- Toggle/Momentary switch: choose latching or momentary footswitch operation
- CTL/EXP jack: connects external footswitch (up to 3 tuning recalls) or expression pedal (real-time pitch sweep)
- 24-bit AD with Adaptive Focus + 32-bit DA conversion at 48 kHz sampling frequency
- Buffered bypass for consistent signal strength on large pedalboards
- Powered by 9V DC adapter or single 9V alkaline battery
- Compact Boss stompbox footprint — fits standard pedalboard layouts
- Compatible with guitar and bass
Brand: Boss
Model: XS-1 Poly Shifter
SKU: XS-1
Condition: New
Since 1872, C.A. House Music has been helping musicians across the Ohio Valley find the right gear -- with real advice from a team that actually plays. We're your authorized dealer of all the big names in guitars, keyboards, band instruments, drums, pro audio, and more. With four family-owned and operated locations in Ohio and West Virginia (plus a full online store), you don't have to go far for instruments, lessons, rentals, and repairs. No matter your musical needs, our team of musicians wants to help you Play Music for Life.
