Walrus Audio Fundamental Series Ambient Reverb Pedal

zZounds Gear Experts Say...
Vast, open reverb sounds in one compact pedal! Walrus Audio's Fundamental Ambient reverb provides three atmospheric reverb algorithms and slider controls.

Because vast ambient sounds shouldn't just be for larger pedals with vast price points, the Walrus Audio Fundamental Ambient brings expansive pillowy reverb to the Fundamental Series with three atmospheric modes in a compact size. The Fundamental Ambient offers a great entry point into ambient exploration with the tonal integrity to live on a professional's pedalboard but with simplified controls friendly enough for even the newest effect pedal users. With Ambient Reverb's three reverb algorithms, you can experiment with deep, dark pad-like sounds to AM Radio-like lo-fi sounds with the flip of a switch.

The Fundamental Ambient provides three different atmospheric reverb algorithms to explore beautifully vast and lush soundscapes with plenty of decay time for pillowy soft pad-like decay.

Decay: Control the amount of reverb decay time. Left is the minimum and right is the maximum amount of time.

Tone: Shapes the overall tonality of the reverb. On Deep and Lush, this controls the cutoff of a synth-style lowpass filter.

On Haze, this controls the width of a resonant bandpass filter, filtering both high and low end at the right, and allowing more high and low to pass through at the left.

Mix: Control the mix of the effect and the original clean signal. All the way to the left outputs only the fully clean signal, and all the way to the right outputs only the affected Reverb signal.

Slide Switch: The slide switch allows you to change between three distinct Reverb algorithms. read more

Deep - A dark, ambient reverb with an added low octave, perfect for creating murky, cavernous sustain or adding a touch of moody atmosphere.
Lush - A breathy, expansive reverb featuring ultra-long sustain. Perfect for generating silky pads and immersive soundscapes with every note.
Haze - A textured, lo-fi reverb featuring distortion, sample rate reduction, and a resonant bandpass tone control, great for vintage or experimental tones.
Trails Modes: The Ambient Reverb comes with trails mode active by default, to disengage trails mode, hold down thebypass stomp switch when applying power to the pedal. Once the LED flashes, it indicates that trails mode is turned off.
To re-engage trails mode, repeat the process, and wait for the LED to turn dark, indicating that trails mode is back on.

With trails mode active, your reverb decay will fade off naturally after turning the pedal off. With trails mode inactive, the decay abruptly cuts off when you turn off the pedal.

*NOTE*: The use of an isolated power supply is recommended for powering all Walrus Audio pedals. Daisy chain power supplies are not recommended. Power supply not included.

Features:

- Expansive pillowy reverb with three atmospheric modes
- Switch between algorithmic landscapes that include: Deep, Lush, and Haze
- Operate controls with slides for: Decay, Tone, and Mix
- Trails mode can be activated or deactivated
- Buffered Bypass
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- Diecast enclosure size: 4.33" x 2.16" x 1.61"
- Power requirements: 9VDC (100mA minimum. Power supply not included.)
- Frequency Response: 20Hz-20kHz
- Noise Floor: -96.5dBu
- Input Impedance: 1M Ohms
- Output Impedance: about 100 Ohm
- Bypass: Buffered Bypass

Dimensions and Weight in Packaging

Base Item

  • Shipping Weight: 0.58 lbs
  • Shipping Dimensions: 5 x 3 x 3 in
  • Manufacturer Part Number (MPN): 900-1086

For support or warranty questions, please contact the manufacturer:
Phone: 405-295-7847
Email: customerservice@walrusaudio.com
Web: https://www.walrusaudio.com/pages/contact

Reviewers gave this product an overall rating of 5 out of 5 stars. (1 ratings)
Submitted August 11, 2025 by Tom L in New Market, MD

"Perfect for Quick Editing and Simple Usage"

Overall: 5 out of 5 stars
(see rating details)
Verified Purchaser zZounds has verified that this reviewer purchased this specific product from us.
I have a specific use for this pedal, which is strictly in a recording scenario. I do have other reverbs (Digitech, Strymon, VST's) that I use for recording, but was interested in the concept of a distinct pedal dedicated to a specific genre or vibe. I am aware that Walrus Audio makes high end products, so I have no fear for the reliability of this unit. I'm also only using this (so far, at least) at home in a super safe environment. There is an available use for this live, and the sounds are very usable. The slider controls are very easy to manipulate and slide well, providing rich clouds of ambient reverb within each of the three reverb modes. It's easy to dial in a plethora of ambient sounds, and even possible to dial in some reverbs that are not as ambient by just adjusting the amount of reverb and volume of reverb. That would definitely work well with live performance with regards to what I play. It is in mono and not stereo, which might be a deal breaker for some, but for my purposes of recording it's not so much an issue. The sounds are gorgeous and huge and can be super cloudy if needed. Or, like I said, it can definitely clean up and just give you some reverb air without being overwhelming. It does seem to make everything a bit more lo-fi sounding, but I'm perfectly fine with this. In fact, it's definitely providing exactly what I wanted as a ambient reverb pedal even in its mono offering. This pedal is proof that something can be simple to operate, priced well, built read more well, and at a very good price point.

Sound
The sound is huge and encompassing when needed. Super, super simple to edit on the fly, no presets, everything is logical and understandable.

Features
Every feature on the pedal is useful. There are zero useless controls. All killer, no filler.

Ease of Use
Super easy to set up, use, and get extremely useful sounds from. It is mono, not stereo, and has a bit of lo-fi ambient reverb quality, but for my needs this is perfect.

Quality
The pedal is very well made. The sliders *could* potentially fail if handled by an ape, but I baby my gear so I'm not worried at all. That said, any pedal I've ever had with sliders never had issues.

Value
This pedal is significantly cheaper than other reverbs like Strymon, but a whole lot more limiting. For my needs, having the limits that the pedal presents allows me to worry more about making music and not scrolling through menus and going down rabbit holes.

Manufacturer Support
I haven't had to contact Walrus Audio for anything. They are extremely reputable and this is my first pedal from them. I have zero doubts regarding the reliability of their products.

The Wow Factor
I wouldn't say that this pedal is indispensable for my needs, but it fills a niche without juggling through menus and having option anxiety. Super quick and easy to use and control. Not much to figure out or understand, perfect for us guitarists!!

Musical Background:
Semi-Pro, Touring Musician, Recording Musician

Musical Style:
Rock, Jazz, Funk, R&B, Blues, Live and Studio
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