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Walrus Audio SLO: An ambient pedal that combines three types of reverb and modulation [Sound demo and reviews]

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Walrus Audio develops innovative and distinctive pedals

It is often seen on the boards of overseas guitarists as a fantastical ambient reverb.

Walrus Audio SLO

This pedal combines three types of reverb algorithms with modulation effects, making it a must-have for fans of ambient music.

walrus audio
36,465 JPY(TAX+) (As of 2026:05 on March 15, 21 | According to Amazon)
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\ Going to meet Sound House's sister /

An older sister I often see

Please use Sound House again next time.

About WALRUS AUDIO | About the brand

About WALRUS AUDIO

Walrus Audio is an effects pedal brand founded in Oklahoma, USA in 2011.
It is characterized by its cutting-edge and sophisticated sound and art design, as well as its innovative, original and high quality.

(From the official website)
Walrus Audio was born in 2011 from a small guitar circle in Norman, Oklahoma, USA. Since the launch of the Voyager overdrive, the product lineup has grown to 25 models. Walrus Audio is a group of artists, musicians, engineers, video game nerds, road bike lovers, and cat lovers. We get together every day to think about how to make this "little box" that creates big hits. We value the perfect balance between art and sound in our product concepts.
"What's the best local coffee shop?"
What influence did the Beatles have on music?
The internal debate never ends.
Walrus Audio is that kind of brand.

Walrus Audio SLO|Spec & Info.

Basic information about Walrus Audio SLO

Effector NameSLO Multi Texture Reverb
BrandWALRUS AUDIO
CategoriesReverb
Specification.■Controls: Decay, Filter, Mix, X, Depth
■Size (WxHxD): 12.1x 6.6x 3.5 cm
■Power supply: 9VDC, power adapter sold separately
■Features: Current consumption: 100mA

Creates dreamy, sleepy reverberations. A multi-texture reverb that dominates the space with impressive tones.

"SlO (Slow)" is a reverb pedal for creating saturated reverberation, dreamy modulation, sleepy tones, and ambient sound images.
Equipped with three types of reverb algorithms tuned with WALRUS AUDIO's tasteful touches.
The impressive reverberation can instantly dominate the space.

None of the three built-in algorithms are a reproduction of any real reverb.
All modes have been designed from the ground up to create a fantastical, dreamy space, from dark, which has a beautiful tone like the aurora twinkling outside the atmosphere, to swell, which creates artistic reverberations that follow your playing, to dream, which is like a daydream where you freeze the tones and layer them.
The artistic sensibility unique to WALRUS AUDIO combined with superior audio technology to create an unprecedented reverb pedal.

Additionally, it comes equipped with cutting-edge features such as a sustain footswitch that instantly extends the decay, modulation waveforms that can be set for each algorithm, and a high-pass filter for fine-tuning the tone.

It depicts the tones that resonate in your subconscious dreams into the real world.

Product functions and features details

■ SlO reverb algorithm
・dark: A shimmer-type reverb that adds -1 octave to the reverberation.
Combined with modulation that allows you to choose from three types of waveforms, you can create a majestic and glittering space. The X knob adjusts the amount of reverb in the -3 octave range. A sound that will take you to the stratosphere far above.

・Rise: An artistic swell reverb that slowly rises in response to your playing. Use the X knob to set the time it takes for the reverberation to rise. A velvety smooth sound.

・dream: Captures the input audio signal, freezes it and stretches it to output a pad-like reverb.
The extended reverberation can be played back infinitely, and phrases can also be layered on top of it.
The freeze/release of the reverberation can be triggered at any time with the sustain switch. The X knob adds vibrato to the frozen reverberation, creating a more day dream/sleepy world.

■ Modulation that can be used in combination with reverb
・sine: Smooth and even pitch up/down modulation.

・warp: Asymmetrical pitch-up modulation inspired by the skipping of old records.

・Sink: A detune effect that slowly sinks the pitch, similar to a Bigsby. Asymmetrical pitch down modulation.

■ Selecting Trail Mode
SlO's smart bypass function allows you to select the reverb trail mode.
Trail enabled mode allows the reverb to decay naturally when the effect is turned off.
Trail Off cuts off the reverb tail as soon as the effect is turned off.
You can switch to bypass mode by pressing the bypass switch while connecting the AC adapter and holding it in for about 2 seconds.
Repeat the same action again to toggle between the two bypass/trail modes.

Features of Walrus Audio SLO
  • A fantastic ambient reverb pedal
  • 3 reverb algorithms
    dark: A shimmer-type reverb that adds -1 octave to the reverberation. When combined with modulation, which has three waveforms to choose from, you can create a majestic and glittering space. The X knob adjusts the amount of -3 octave reverb. A sound that seems to take you to the stratosphere far above.
    ise: An artistic swell reverb that slowly builds up in response to your playing.
    dream: Captures the input audio signal, freezes it, and stretches it to create pad-like reverberations.
  • Modulation that can be used in combination
    sine: Smooth and even pitch up/down modulation.
    warp: Asymmetrical pitch-up modulation inspired by the skipping of old records.
    sink: A detune effect similar to a Bigsby, where the pitch slowly sinks. Asymmetrical pitch down modulation.
  • Trail mode adjusts the reverb decay

Walrus Audio SLO | Sound Demo

Walrus Audio SLO | Review and reputation

All three modes (Dark, Rise, Dream) produce exquisitely good reverberation.
The Dream mode in particular is a great match for flashy distortion such as the BIG MUFF, and the sound is so appealing that it's hard to think of anything else to use when playing thunderous sounds.
You can also keep the reverberation going with the Sustain switch. You can set it up between songs, or leave it on in the postlude, for a fantastical effect.
You can kill dry by turning the mix knob all the way up. My personal preference is to turn it a little more exaggerated, around 1 o'clock to 3 o'clock.
The sound image is not one of deep and grandiose sound, but rather of a unique floating feeling, like a shallow daydream.
There is a video on the Walrus audio channel on YouTube, so if you listen to it and intuitively like it, I'm sure it will become a pedal that you'll use for the rest of your life.

Sound House Than

The modes are dream/dark/rise, which is something that would never be imagined with a normal concept of reverb, and the sound has a depth and atmosphere that can only be achieved with slo.
This is the perfect effector for arranging spaces with moving sounds in ambient/post-rock/jazz and other genres.
It has a wide range so it can of course be used as a normal reverb.

AmazonThan
walrus audio
36,465 JPY(TAX+) (As of 2026:05 on March 15, 21 | According to Amazon)

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An older sister I often see

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