Walrus Audio took my favorite reverb, the Slö, put even more sounds and features into it, and made it stereo. Enter the Slöer.
Running the Slöer through its paces and bathing in all the stereo goodness kinda ruined me forever. I finally understand all the stereo fanatics.
The panel reads left to right: Decay, Filter, Depth, and Mix across the top row. Below them sit the Width toggle, two sliders (X and Stretch), and the Mode rotary.
Decay sets how long the tails ring out. Filter shapes their tone, and the sweep in the demo above shows how useful it is for taming the upper octaves in Light mode. Depth controls how much modulation is applied to the tails. Mix blends wet and dry.
X controls the intensity of each mode’s specific effect applied to the reverb tails, and its function shifts depending on the mode. Stretch lowers the sample rate as you pull it down, lengthening the decay and introducing lo-fi artifacts. The Width toggle sets the stereo spread across three positions.
Hold down the bypass switch and three controls change function: Mix becomes stereo panning, Depth controls modulation rate, and the Mode rotary selects the modulation waveform from five shapes (Sine, Warp, Sink, Square, Random). In the demo I’ve set up sweeps for Filter, Depth, Rate, Panning, X, Stretch, Width, and Waveform so you can hear each one in isolation.
Five modes cover a wide range of ambient territory. Dark adds a lower octave to the reverb trail. Rise is an auto-swell that holds back the reverb until after you play, with X setting the swell timing. Dream latches into a pad you can hold indefinitely with the sustain switch. Rain is a diffusion-based effect with delay-like tap echo characteristics. Light adds an octave-up shimmer, running from subtle pad to full shimmer as you turn up X.
The presets map those modes directly: Hazy Space (Dark, decay at 8, stretch maxed) sits wide and deep. Fairy Choir (Light, X at 10) turns the octave-up shimmer all the way into choir territory. Almost a Delay (Rain, filter fully open at 10, Width wide) leans into that mode’s echo-like delay taps. Majestic and Deep (Dream, X at 9) is the most cinematic of the five. Smooth Swell (Rise, decay at 6, X at 3) uses the auto-swell as the gentlest way in.
From a recording and production standpoint, stereo reverb makes so much sense. There’s just more of a feeling of being in that space. The expanded range of sounds is spot on. The LIGHT and RAIN modes complement the other three perfectly. The STRETCH slider is great for smearing the reverb effects and making everything sound even more magic.
The Slö is the Slöer’s smaller mono sibling. It has three modes (Dark, Rise, Dream) against the Slöer’s five, three modulation waveforms (Sine, Warp, Sink) against five, and no X or Stretch sliders. It also runs mono in and out. If you’re already happy with Dark, Rise, and Dream and you’re working in a mono setup, the Slö gives you the core character without the extra real estate. The Slöer earns its larger footprint with Rain, Light, the Stretch slider, stereo width control, and the hold-function secondary controls that let you dial in modulation independently per preset. If stereo output or those two extra modes are part of what you’re after, the step up makes sense.
Ambient, shoegaze, and post-rock players are the obvious audience, and the Slöer handles all of it with room to spare. It also works well as a studio utility, since the stereo output and the three onboard saveable presets with spillover make it easy to set and recall specific sounds in a session. The hold-down secondary controls add enough modulation flexibility that you can go from subtle shimmer to heavily modulated oddness within a single mode.
If lush modulated reverb is all you need and stereo isn’t part of your setup, the Slö covers the essentials at a smaller footprint. But if you’re recording stereo or want Rain and Light in your toolkit, the Slöer is the more complete instrument.
Eight innovative pedals that transform your guitar into an ambient and experimental soundscape machine. From reverse delays and octave shifters ...
Discover budget-friendly guitar pedals that punch above their price point. From the classic BOSS DS-1 to the versatile Walrus Audio ...
Master the cinematic guitar tones of Explosions in the Sky, Godspeed You! Black Emperor, and This Will Destroy You with ...
More pedals, more fun 
'Cause why not? 
Feeling pedalbored? Buy through these links and support Loopy Demos at no extra cost to you.
Get detailed specs on Walrus Audio's website
<div data-loopydemos="walrus-audio-sloer" data-title="Walrus Audio Slöer | Loopy Demos" data-width="400" data-height="540"></div>
<script src="https://loopydemos.com/embed.js" async></script>To embed this demo on your website, copy & paste the code above or customize your demo widget