Walrus Audio Xero Polylooper Black

A Modern Looper Designed for Polyrhythmic Constructions

The Xero PolyLooper belongs to the new generation of performance-oriented loopers: instead of being limited to a single track, it offers two loop channels with separate settings, and especially a Poly mode designed to create rhythmic overlays (examples: 3:4, 5:7) while maintaining a common time base. The result: you move from a simple practice loop to genuine song structures, playable and adjustable on stage.

For Whom, Which Styles, and In What Contexts?

The Xero is aimed equally at guitarists who want to work on their riffs and live musicians who build layers in real-time. It suits ambient aesthetics very well (infinite textures, reverse, slowed speeds), rock and indie (two "track" arrangements), as well as math rock and electro-live worlds thanks to polyrhythms and MIDI sync. In the studio, it becomes a fast writing tool; on stage, its LEDs and foot gestures prevent having to "dive" into menus.

Controls, Modes, and Integration: Everything at Your Feet

Each channel has its own volume and stereo pan, handy for opening up a mix or creating a left/right dialogue on a stereo pedalboard. The Speed FX provide access to 0.5x / 1x / 2x speeds, and the direction (forward / reverse) is adjustable independently per channel: ideal for "remixing" a loop on the fly.

Control relies on two footswitches and simple gestures: record/playback, stop, undo, channel toggle, full stop, or full erase. For demanding live setups, the pedal accepts a dual external footswitch to extend access to secondary functions and keep both channels under control. Finally, integration is complete thanks to MIDI (clock and control) and USB-C for firmware updates.

Sound

As a looper, the Xero aims for faithful and clean reproduction: it does not seek to color your sound like an overdrive but to preserve the attack, dynamics, and grain of your guitar (or your chain) during layering. The stereo pan per channel is a real plus to avoid the typical "block in the center" effect of loopers and to build clear layers. With its speed and reverse options, it also excels in atmospheres: stretched pads, granular tape-style loops, or contrasts between a stable rhythmic channel and a transformed second channel.

Technical specifications

Effects	Looper / Sampler	Type	sector
Technology	Digital	Use	electric guitar
Format	Pedal	Color	Black
Number of tracks	2

Recording length	up to 3 minutes per channel	Signal-to-noise ratio (engaged)	86 dB
Per-channel controls	volume and stereo pan	Signal-to-noise ratio (bypass)	110 dB
3 looping modes	Sync, Unsynced, Poly (polyrhythmic)	Noise level (engaged)	-93 dBu
Speed effects (Speed FX)	0.5x / 1x / 2x	Noise level (bypass)	-116 dBu
Reverse playback	reverse per channel	Headroom (engaged)	5.2 Vpp / +7.5 dBu at 1 kHz, below 1% THD+N
Stereo inputs (dual mono)	2 x 6.35mm Jack (L/R)	Processing platform	Walrus MDSP
Stereo outputs (dual mono)	2 x 6.35mm Jack (L/R)	Dimensions	121 x 66 x 35 mm
Input for dual external footswitch	6.35mm stereo Jack (TRS)	Weight	0.37 kg
MIDI IN	3.5mm stereo Jack (TRS, Type A)	Required power supply	9V DC
MIDI THRU	3.5mm stereo Jack (TRS)	Consumption	minimum 300 mA
MIDI control	supports full MIDI CC mapping (looping, playback, Speed FX, etc.)	Polarity	center negative
Input impedance	1.1 M Ohms	Connector	2.1 mm (center pin), 5.5 mm (barrel)
Output impedance	1 k Ohms