Walrus Audio Xero Polylooper

The Walrus Audio Xero Polylooper is a true bypass, dual-channel looping pedal with independent loop control on each channel, stereo in and out with per-channel panning, and three loop sync modes: Sync, Unsynced and Poly¹. Each channel records up to three minutes with near infinite stacking of overdubs¹, and the pedal offers real-time speed adjustment from 0.5x to 2x, loop reverse and loop panning²³. It was announced by Walrus Audio on 29 July 2025⁴ and sold for $299³, but it is now discontinued and no longer available¹.

Sync, Unsynced and Poly modes

The core idea of the Xero is that its two loop channels do not have to relate to each other in one fixed way. You switch between three flexible loop sync modes¹:

Sync Mode gives you a rigid rhythmic structure, with every loop locked to the first one you recorded⁴. Unsynced Mode is the opposite: two loops of different lengths drifting against each other, which suits ambient textures and free improvisation. Poly Mode is the distinctive option, letting you set up polyrhythmic relationships between the channels using shared time divisions, with MIDI clock available when you want precise syncing¹.

In Sync and Poly modes, FX activation synchronizes to the loop start, which ensures accurate timing when you trigger speed effects on the beat⁴.

The footswitches and controls

There are no menus. Everything is done with two stomp switches, a handful of knobs and a multicolour LED system that uses red, green and white per channel to indicate recording and playback status¹⁴.

Each channel has its own set of controls¹:

• Speed: 0.5x / 1x / 2x playback speed on channel 1 when Speed FX is active; 0.5x / 1x / 2x playback on channel 2¹
• Pan 1: Stereo balance for loop playback¹
• Pan 2: Independent stereo placement¹

Because the pedal is menu-free, learning it means learning the LED color system. Gearnews' Jef found that straightforward but conditional: "The fact that it has no menus is great for someone like me, who hates menu diving, but may not be for everyone."⁴

An EXT switch on the panel connects an external dual footswitch³, and the 1/8" MIDI IN/THRU (Type A) jack provides clock sync, remote control and full MIDI CC control for looping, playback, speed FX and more, while passing MIDI THRU to downstream devices¹.

Power and connections

The Xero runs on a 9V DC supply delivering 300mA minimum, center negative, with a 2.1mm center pin and 5.5mm barrel connector¹. That 300mA draw rules out a battery and is worth checking against a small daisy chain power supply before you build around one.

Connections are standard inputs Mono (L) and Stereo (R), standard outputs Mono (L) and Stereo (R), the EXT switch, and the 1/8" MIDI jack³. The die-cast enclosure measures 4.6" x 3.9" x 2.3" including jacks¹, and Guitar World lists its origin as USA³.

Other maker specifications¹:

• Input impedance: 1.1M Ohms
• Output impedance: 1k Ohms
• Headroom engaged: 5.2Vpp / +7.5dBu at 1k Hz
• Signal-to-noise ratio engaged: 86dB
• Noise floor engaged: -93dBu

What reviewers said

Guitar World's Trevor Curwen found the pedal rewarding once past its learning curve: "While the Xero is initially a little complicated, once you get the hang of it, this looper has many practical applications."³ His review lists the features as true bypass, up to 3 minutes' looping, 2 channels, variable loop speed, loop reverse and loop panning³.

Guitar.com's Richard Purvis reviewed it as "a device that offers three minutes of recording time"⁷, and noted that the v1.10 firmware update of December 2025 fixed an issue where only one overdub at a time was possible⁷. Walrus Audio posts firmware releases on its website, so an owner can check for updates there¹.

On build, Gearnews' Jef wrote: "Walrus Audio knows how to create road-worthy pedals, so this design should be great for working musicians."⁴

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