The Walrus Audio Fundamental Series Delay is a compact delay pedal that puts three delay algorithms in one box: clean digital delay, an analog delay emulation, and reverse delay. Walrus Audio positions it as a pedal that delivers "the core sounds of repeated effects with the tonal integrity to live on a professional's pedalboard but with simplified controls friendly enough for even the newest effect pedal users"1. It sells for $99.99, with blemished units offered at $84.99 where the flaws are cosmetic only, such as scratches or dents in the finish1.
The pedal comes in a diecast enclosure measuring 4.33" x 2.16" x 1.61", finished in black with green and off-white ink1. It is designed and assembled at Walrus Audio headquarters in Oklahoma City, Oklahoma, and carries the maker's limited lifetime warranty2.
Digital, analog and reverse delay in one pedal
The slide switch on the pedal changes between the three delay algorithms, and each one has a distinct character1:
| Mode | What it does |
|---|---|
| Digital | Adds a clean rhythmic delay back into your signal, with transparent repeats1 |
| Analog | Adds a filtered and slightly distorted delay, designed to replicate the characteristics of bucket brigade delay chips1 |
| Reverse | Adds reversed trails back into your signal, creates gentle melodies, or pushes into reverse feedback overload1 |
The Digital mode is the straightforward option: repeats that stay clear rather than degrading. Analog mode is built to imitate bucket brigade chips, the components behind classic analog delay pedals, where each repeat is slightly darker and more distorted than the last. Reverse mode is the creative one, playing your repeats backwards for swells and textures, and it can be pushed into feedback overload for more extreme sounds1.
The controls: three faders and a mode switch
Every pedal in the Fundamental Series shares the same control layout: three faders for tweaking the sound and a three-way switch for changing pedal modes3. Guitar World described the layout at the series launch as "three parameter sliders (which obviously vary by unit) and a three-position" mode switch4, and Guitar.com's Josh Gardner noted the series uses "a three-way mode switch and three sliders instead of boring old potentiometers"5.
For the Delay, the fader the maker documents in detail is Time, which controls the rate of the delayed repeats, with a maximum delay time of one second1. The slide switch selects between the three algorithms described above1.
Tap tempo and trails
Tap mode is where the pedal hides its extra features. To enter it, hold down the bypass stompswitch until the LED flashes1. Once in tap mode, the stompswitch works only as a tap tempo control until you disengage it1. The tap divisions available are quarter note, dotted eighth note, and eighth note, set by a slide switch position2. Dotted eighth is the division most players reach for to get the rhythmic, "cascade" delay made famous on countless records.
The Fundamental Delay uses buffered bypass, not true bypass. In the Fundamental Series, Walrus Audio fits true bypass on the gain pedals (Drive, Distortion, Fuzz, Tremolo) and buffered bypass on the time-based pedals (Chorus, Phaser, Delay, Reverb)6. A buffer keeps your signal strong through long cable runs, but it means the pedal is never fully out of the circuit.
Power and warranty
Power requirements are 9V DC with a 100mA minimum1. That current draw is modest but not trivial, so an isolated output or a supply rated comfortably above 100mA is the practical choice. All Walrus Audio products, the Fundamental Delay included, are covered by the maker's limited lifetime warranty2.
The Fundamental Series and the Lo-Fi Delay
The Fundamental Delay is part of Walrus Audio's Fundamental Series, a line of small, inexpensive pedals covering the core effect types. Guitar.com's review of the series describes it as "Drive, fuzz, delay and phaser pedals, made in the USA"5, and MusicRadar reported in May 2023 that the series was available to buy from Andertons and Sweetwater7. The series has since grown well past its original members: in September 2026, Guitar Pedal X reported the Walrus Audio Fundamental Series Lo-Fi Delay as the 10th release in the line8.
The Lo-Fi Delay is a different pedal from the Fundamental Delay covered here. It is a filtered lo-fi delay with Time (up to 1,000ms), Feedback and Mix controls, and an AM / MURK / ECHO mode switch, priced at $998. Its AM mode is described as "a bright delay with a high-pass filter, light harmonic distortion, and dual wow and flutter modulation on the repeats"8. Where the Fundamental Delay aims for clean, core delay sounds, the Lo-Fi Delay deliberately degrades them.
Players who want more than the Fundamental Delay's one second of delay time or its three algorithms can look at Walrus Audio's larger delay pedals, such as the Mako Series D1 High-Fidelity Delay or the Bellwether, but those sit at a different price point. Within the Fundamental Series itself, the Delay's combination of three algorithms, tap tempo and a $99.99 price is what distinguishes it from the simpler members of the line1.
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Questions
What is the maximum delay time on the Walrus Fundamental Delay?
The maximum delay time is one second. The Time fader controls the rate of the delayed repeats, and the longest repeat it can produce tops out at 1,000 milliseconds, which covers rhythmic slapback through longer ambient trails.
Is the Walrus Fundamental Delay true bypass?
No. The Fundamental Delay uses buffered bypass. In the Fundamental Series, Walrus Audio fits true bypass on the gain pedals (Drive, Distortion, Fuzz, Tremolo) and buffered bypass on the time-based pedals (Chorus, Phaser, Delay, Reverb).
How do you turn on tap tempo on the Walrus Fundamental Delay?
Hold down the bypass stompswitch until the LED flashes. The pedal is then in tap mode, and the stompswitch works only as a tap tempo control until you disengage it. Tap divisions are quarter note, dotted eighth note, and eighth note.
How much power does the Walrus Fundamental Delay need?
It runs on 9V DC with a minimum of 100mA, center negative. That is more current than some small pedals draw, so a dedicated 9V supply or an isolated output is the safe way to power it.
Where are Walrus Fundamental pedals made?
Walrus Audio designs and assembles the Fundamental Delay at its headquarters in Oklahoma City, Oklahoma. Guitar.com's review of the series also describes the Fundamental pedals as made in the USA.
Sources (8)
- Fundamental Series Delay, Walrus Audio
- Fundamental Series Delay, Walrus Audio
- Fundamental Series Drive, Walrus Audio
- NAMM 2023: Walrus Audio's worst-kept secret, the Fundamental series, makes a surprise arrival in stores from today, Guitar World, 2023-04-06
- Walrus Audio’s Fundamental Series is redefining entry-level pedals, Guitar.com, 2023-06-30
- Walrus Audio Fundamental Series Pedals review, Guitar World, 2023-06-30
- The must-have new guitar effects pedals of 2023, MusicRadar, 2023-05-04
- Guitar Pedal X, Guitar Pedal X, 2026-09-16
