Boss XS-100 Poly Shifter Pedal

zZounds Gear Experts Say...
Polyphonic pitch control with studio-grade tracking, Boss’ XS-100 poly shifter offers a +/- 4-octave range, 30 memories, USB-C, MIDI, and expression support.

The XS-100 Poly Shifter redefines pedal-based pitch shifting with groundbreaking BOSS technology years in the making. Delivering natural sound, precision tracking, and deep customization options, this powerhouse expression machine transforms how you perform with pitch. Glide up or down four full octaves with the ultra-smooth pedal to infuse your music with evocative colors. Enhance solos by triggering bold shifts with a single foot switch press. Instantly retune your instrument with drop tunings, capo simulations, and more. And with onboard memories, your favorite setups are always ready when you need them.

Natural Sound with Advanced BOSS Technology

In developing the XS series, BOSS engineers pioneered methods to advance real-time pitch shifting and eliminate the tonal artifacts common in conventional designs. Powered by finely tuned algorithms and a specially selected DSP platform, the XS-100 provides balanced polyphonic performance that feels natural and musical across all playing styles, pickup positions, and pedal setups. Your instrument's attack and tonal character are fully preserved, and even complex chords and sustained lead tones--typically a challenge for pitch shifters--are reproduced with stunning clarity.

Total Pitch Control
With the XS-100 underfoot, you're in full command of nearly any pitch effect imaginable. The responsive pedal offers linear control of four octaves up or down, and independent pitch-change speeds for each pedal direction make it easy to read more produce motor revving tones and other interesting effects. At the end of the pedal's travel, you can use the integrated toe switch to introduce momentary pitch jumps with adjustable range and rise/fall time. Two foot switches are also available to bypass the pedal shift and quickly retune your instrument at fixed semitone steps across eight octaves.

Customize and Save
The XS-100 gives you the tools to shape pitch effects with precision and personality. Customize the pedal's range for different songs or techniques and fine-tune the response curve to suit your playing style. Freely reassign the toe switch and foot switches to alternate functions. Craft rich doubling effects with the detuning option and explore many other ways to refine your sound. Once everything's dialed in, save your setup to one of 30 memories for instant recall during live sets or studio sessions.

Integrate with Every Rig
Filled with flexible connectivity, the XS-100 flows with every performance setup. Up to two external foot switches or an expression pedal are supported, expanding your real-time control options. MIDI I/O opens the door to more advanced applications, from external MIDI control to sending MIDI commands with the pedal and foot switches. There's also a secondary output that mirrors the input signal, providing parallel routing flexibility for sophisticated rigs.

Features:

- Advanced pitch-shifting workstation with deep control options and an eight-octave range
- Total pitch control for guitar and bass
- Class-leading pitch shifting quality realized with BOSS algorithms
- Clear response and natural feel that retains the fundamental sound character
- Smooth onboard pedal with integrated toe switch provides linear pitch control across +/- four octaves
- Fixed pitch settings in semitone steps across eight octaves for drop tunings, capo effects, and otherworldly tones
- Detune function (+/- 50 cents) to create rich doubling effects
- Adjustable pedal curve and response
- Fully customizable toe switch and foot switches for momentary pitch changes, instant retuning, and more
- Clear display for editing sounds and 30 memories for storing favorite setups
- Dedicated analog output that mirrors the input signal
- Connect up to two foot switches or an expression pedal for extended control
- TRS MIDI I/O for external control and sending MIDI commands with the pedal and foot switches
- USB connector for system updates
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- AD conversion: 24 bits + AF method
AF method (Adaptive Focus method) This is a proprietary method from Roland & BOSS that vastly improves the signal-to-noise (SN) ratio of the AD and DA converters.
- DA conversion: 32 bits
- Sampling Frequency: 48 kHz
- Memories: 30
- Nominal input level: -10 dBu
- Maximum Input Level:- +7 dBu
Input impedance: 2.2 MOhm
- Nominal output level: -10 dBu
- Maximum output Level: +7 dBu
- Output impedance: 1 kOhm
- Recommended load impedance: Output: 10 kOhm or greater
- Bypass: Buffered bypass
- Controls:
- EFFECT switch
- TUNE DOWN switch
- SELECT knob
- EFFECT button
- MEMORY button
- EXP1 pedal
- Display: Graphic LCD (64 x 32 dots, backlit LCD)
- Connectors:
- INPUT jack: 1/4-inch phone type
- THRU jack: 1/4-inch phone type
- OUTPUT jacks: 1/4-inch phone type
- CTL1, 2/EXP2 jack: 1/4-inch TRS phone type
- USB port: USB Type-C(R)
- MIDI (IN, OUT) connectors: Stereo miniature phone type
- DC IN jack
- Power supply: AC adaptor
- Current draw: 160 mA
- Power: Power consumption when in OFF mode (when the power automatically turns off): 0.1 W
- Dimensions (W x D x H): 5-13/16 x 9-1/16 x 2-7/8 inches / 147 x 230 x 72 mm
- Maximum height (W x D x H): 5-13/16 x 9-1/16 x 3-13/16 inches / 147 x 230 x 96 mm
- Weight: 1.7kg / 3 lbs 12 oz
- Accessories:
- AC adaptor
- Leaflet ("USING THE UNIT SAFELY", "IMPORTANT NOTES" and "Information")
- Rubber foot x 4
- Options (sold separately):
- Footswitch: FS-5U
- Dual footswitch: FS-6, FS-7
- Expression Pedal: EV-30, FV-500L, FV-500H, Roland EV-5
- MIDI/TRS connecting cable: BMIDI-5-35, BMIDI-1-35, BMIDI-2-35, BCC-1-3535, BCC-2-3535
0 dBu = 0.775 Vrms

Dimensions and Weight in Packaging

Base Item

  • Shipping Weight: 4.32 lbs
  • Shipping Dimensions: 12 x 12 x 4 in
  • Manufacturer Part Number (MPN): XS-100

For support or warranty questions, please contact the manufacturer:
Phone: 323-890-3700
Web: https://www.boss.info/us/support/

Reviewers gave this product an overall rating of 4.5 out of 5 stars. (1 ratings)
Submitted October 1, 2025 by a customer from gmail.com

"Fianlly, a Boss style whammy pedal"

Overall: 4.5 out of 5 stars
(see rating details)
Verified Purchaser zZounds has verified that this reviewer purchased this specific product from us.
I heard about this pedal 2 weeks ago, it was released last Thursday and zZounds had it at my door the very next day. I realize the purpose of this pedal is for drop tune style playing which I do not play. I'm old school GenX and I play standard tuning. I have for 30+ years and will probably never drop tune. I use this pedal as a 'whammy' style pedal, and as a stand alone pitch shifter for guitar harmonies. There is a slight learning curb as this pedal is not as easy to operate as the actual whammy pedal because the whammy only has 1 knob, you have to work to get great tones out of the XS-100. I've only played it for about an hour since I got it, but it sounds so good. Boss was really lacking a quality sounding pitch shifter. The EHX Pitchfork and Digitech Whammy polyphonic pitch shifts sound so amazing, and the Boss pedals were lacking in this field, but not no more. Boss has really stepped up their pitch shifting game with the XS-100.
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