The Slöer Stereo Ambient Reverb Onyx Edition is a limited-run finish of the Slöer, a stereo ambient reverb pedal made by Walrus Audio. The Slöer builds on the maker's popular Slö lineup but adds two additional reverb algorithms, a stereo width control, and additional modulation wave shapes1. Walrus Audio describes the result as a way to "create immersive, lush, modulated, sleepy, and ambient soundscapes with more width and depth than ever before"1.
The Onyx Edition itself is a limited run, and it is listed as sold out on the maker's Onyx Series page2. A blemished-unit listing for the Slöer on the maker's site is also marked sold out1.
The Onyx Edition is a limited run and is sold out at Walrus Audio's store2. The standard Slöer Stereo Ambient Reverb is listed separately on the maker's site5.
A Slö variant with two added reverb algorithms
The Slöer takes the three reverb modes players know from the Slö, Dark, Rise and Dream, and adds two more, Rain and Light, for five algorithms in total3. A five-way rotary dial selects the mode, and its secondary function switches between five different wave shapes that modulate the reverb trail5.
| Mode | What it does |
|---|---|
| Dark | Lower octave reverb3 |
| Rise | Ambient swell, an auto-swell reverb for cinematic swells1 |
| Dream | Latching pad reverb4 |
| Rain | Delay tap diffusion, reverb with delay taps4 |
| Light | High octave shimmer3 |
In Dark mode, the X knob sets the level of a -1 octave signal that feeds the reverb5. The pedal's controls cover decay, filter, depth, mix, width, X, stretch and mode4. One of the five modulation wave shapes is Square, which Walrus Audio describes as "Symmetric pitch up and down modulation for stepped modulation"3.
The Slöer also holds three onboard presets. You save one by simultaneously pressing and holding the bypass and sustain switches, and scroll through them by simultaneously pressing and releasing the same two switches1.
Modes and stereo width
The headline difference from the mono Slö is stereo. The Slöer offers true stereo width with a dedicated stereo width control, so each note can turn into a space that keeps spreading across a stereo rig5. With five reverb algorithms, five modulation wave shapes and true stereo width, the pedal is aimed at players building ambient textures on a stereo pedalboard5.
What the press said
Gearnews covered the Slöer at launch, noting that it carries the three Slö modes plus Rain and Light, and listing its full control set of decay, filter, depth, mix, width, X, stretch and mode4. The reviewer's overall take:
"Walrus Audio makes some great effects pedals and this new Slöer Stereo Ambient Reverb looks to be one of them, as it adds all the good stuff."
Slö versus Slöer
For a player comparing the two, the differences are concrete. The Slöer keeps the Slö's Dark, Rise and Dream algorithms and adds Rain and Light3. It adds a stereo width control and additional modulation wave shapes, and it runs in true stereo rather than mono15. The Slöer also carries three onboard presets and uses buffered bypass51. Players weighing other Walrus Audio ambient options can also look at the Lüm Texture Engine and the Fundamental Ambient, or the broader reverb pedals category.
All Walrus Audio products, including the Slöer, are covered by the maker's limited lifetime warranty5.
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Questions
Is the Walrus Audio Slöer true bypass?
No. The Slöer uses buffered bypass rather than true bypass, as listed in the maker's specifications. A buffered bypass keeps a buffer in the signal path when the pedal is off, which can help preserve high end over long cable runs, unlike true bypass which passes the signal straight through.
Is the Slöer Onyx Edition still available?
No. The Onyx Edition is listed as sold out on Walrus Audio's own store, and the maker's Onyx Series index marks it as a sold-out limited run. The standard Slöer Stereo Ambient Reverb is a separate product page on the maker's site.
Is the Slöer Onyx Edition a limited run?
Yes. Walrus Audio's Onyx Series page lists the Slöer Stereo Ambient Reverb Onyx Edition as a limited run. It is one of a series of Onyx Edition finishes the maker has offered across its pedal lineup.
Does the Walrus Audio Slöer come with a warranty?
Yes. Walrus Audio states that all of its products, the Slöer included, are covered by a limited lifetime warranty. The coverage applies to the pedal as sold by the maker.
Can the Slöer run in stereo?
Yes. The Slöer is a stereo reverb with true stereo width, and it includes a dedicated stereo width control among its knobs. Walrus Audio positions it as a way to build ambient soundscapes with more width and depth than the mono Slö.
What is the difference between the Slö and the Slöer?
The Slöer builds on the Slö lineup but adds two additional reverb algorithms, a stereo width control, and additional modulation wave shapes. The Slö's three modes, Dark, Rise and Dream, carry over, and the Slöer adds Rain and Light modes for a total of five.
Sources (5)
- Slöer Stereo Ambient Reverb, Walrus Audio
- The Onyx Series, Walrus Audio
- Slöer Stereo Ambient Reverb, Black Friday 2024 Floral Series, Walrus Audio
- Walrus Audio Slöer Stereo Ambient Reverb: Now with Stretch, gearnews.com, 2023-07-18
- Slöer Stereo Ambient Reverb, Walrus Audio
