midi looper pedal Walrus Xero Polylooper Black Looper Pedal – Chicago Music Exchange

midi looper pedal Walrus Xero Polylooper Black Looper Pedal – Chicago Music ExchangeThe Xero Polylooper is a true bypass, dual channel looping powerhouse with independent loop control on each channel, stereo panning, variable playback speed, reverse playback, three looping modes, and intuitive stomp gestures. The Xero is your new partner for perpetually endless ways to create new song ideas, practice your licks, or build endless textures on stage. Two Loop Channels, Fully Independent Control Xero gives you two independent loop

The Xero Polylooper is a true bypass, dual-channel looping powerhouse with independent loop control on each channel, stereo panning, variable playback speed, reverse playback, three looping modes, and intuitive stomp gestures. The Xero is your new partner for perpetually endless ways to create new song ideas, practice your licks, or build endless textures on stage.

Two Loop Channels, Fully Independent Control
Xero gives you two independent loop channels—each with its own:  Loop up to 3 minutes with near infinite stacking of loops  Unlimited overdubs

• Volume and Pan controls
• Playback speed (0.5x / 1x / 2x)
• Reverse playback option  

You can loop on each channel individually or stack them together to build complex, layered compositions—all in real time.

Play Naturally. Control Effortlessly.
The Xero's dual stomp switches keep loop control fast and intuitive:  Tap the left stomp switch to record and playback loops

• Hold the left stomp to undo
• Tap the right stomp switch to stop loop playback
• Hold the right stomp for speed FX
• Double-press both switches to toggle channel control

Double-hold to trigger full stop or full erase With built-in gestures, you stay in control without menu-diving or complex tap dances. Need even more control? Plug in an external dual-stomp switch to simultaneously take full command of both channels—perfect for live performers and loop-centric setups.
Looping Modes Built for Any Workflow

Switch between three flexible loop sync modes:  Sync Mode – Keeps all loops time-aligned to the first recorded loop

Unsynced Mode – Let each channel record loops of completely independent lengths

Poly Mode – Create polyrhythms using shared time divisions (3:4, 5:7, etc.) for interlocking textures
(Supports MIDI clock for precision syncing)

Visual Feedback That Keeps You Locked In
Each channel has its own multicolor LED system showing:

• Red, Green, and White for recording and playback controls
• Cyan, Pink, Yellow, and Blue LEDs for different speed effects
• Channel Control Status via dedicated red LEDs

Instantly know what's happening—no guesswork needed, even mid-performance.

Speed FX & Direction Controls
Want to flip your loop upside down or twist it in time? Activate Speed FX to unlock:

• Half / Normal / Double speed
• Reverse playback - Each channel’s playback behavior can be manipulated independently, letting you remix on the fly.
• FX activation syncs to loop start in Sync and Poly modes, ensuring accurate timing

Bypass That Listens
The Xero features true relay bypass—when no loops are active, the pedal automatically disengages, keeping your tone completely untouched.

Stereo. MIDI. USB. Ready to Integrate.

• 1/8” MIDI IN/THRU (Type A) for clock sync and remote control
• USB-C for easy firmware updates via walrusaudio.io
• Stereo in/out with full panning control on each channel
• Compatible with Chrome on Mac or Windows for web-based updates

Breakdown of Control Layout 
Channel 1

• Pan 1: Stereo balance for loop playback
• Vol 1: Channel output volume with +3dB of headroom
• Speed: 0.5x / 1x / 2x playback speed (when Speed FX is active)
• Direction: Forward or reverse loop playback

Channel 2

• Pan 2: Independent stereo placement
• Vol 2: Channel 2 volume with +3dB boost
• Speed: 0.5x / 1x / 2x playback
• Direction: Forward or reverse loop playback

External Dual Stomp Compatibility

• Breakout and expand stomp controls and add quicker access to secondary features with a TRS dual foot switch

MIDI Integration

• Accepts 1/8” TRS MIDI IN (Type A)
• Sends MIDI THRU to downstream devices
• Supports full MIDI CC control for looping, playback, speed FX, and more  

Firmware Updates

• Via USB-C using the Chrome browser on Mac or Windows
• Visit walrusaudio.io to check for the latest firmware releases

Specs 

• 9v 300mA Minimum
• Center Negative, 2.1mm center pin, 5.5mm barrel
• Exact size of the die-cast enclosure is 4.6” x 3.9” x 2.3” including jacks.
• Input impedance - 1.1M Ohms
• Output impedance - 1k Ohms
• SNR engaged = 86dB
• SNR bypassed = 110dB
• Noise floor engaged = -93dBu
• Noise floor bypassed = -116dBu
• Headroom engaged = 5.2Vpp / +7.5dBu @ 1k Hz < 1% THD+N