J. Rockett Audio Designs J. Rockett Uni-Verb

The J. Rockett Uni-Verb is a dual-effect pedal from J. Rockett Audio Designs that puts a photocell analog Uni-Vibe-style chorus/vibrato and a spring reverb in one box. J. Rockett describes it as a painstakingly accurate photocell analog vibe based on the original Uni-Vibe pedal, with a spring reverb added¹. Premier Guitar's John Bohlinger summed up the combination as "a spring reverb tank for adding boing-y goodness to this stompbox's swirling, Doppler-like ear candy"².

It arrived in July 2022 as the second pedal in J. Rockett's Classic Series, priced at $449.00³⁴, and it is built in the USA⁵.

What it is and what it does

The vibe side follows the classic Shin-Ei/Univox Uni-Vibe: an optical circuit with four light-dependent resistors arranged around a bulb, the same photocell approach as the vintage units⁹⁵. The reverb side emulates a spring reverb tank, in the style of the tanks built into amps a decade before the '60s Uni-Vibe itself⁵⁷. Where many modulation-plus-reverb combo pedals aim at ambient or psychedelic territory, Delicious Audio noted that the Uni-Verb takes the idea in a more classic direction⁸.

The two effects are not locked together. An effects loop built into the pedal separates the vibe and reverb, so you can use both at once or either one on its own⁷. On Premier Guitar's demo page, John Bohlinger confirmed you can use the two effects individually or simultaneously².

The controls

J. Rockett's product page lists the controls¹, and the press coverage fills out how they behave:

There is also an internal trimpot for adjusting the vibe tone⁹. The vibrato/chorus selection is footswitchable, an improvement over the original Uni-Vibe's panel switch⁸.

The pedal carries three footswitches: one engages the reverb, one handles vibrato/chorus selection, and one is the bypass¹⁰⁵.

Power: standard 9V, run internally at 24V

The original Uni-Vibe ran its circuit at 24V. The Uni-Verb does the same, but you do not need a special supply for it: J. Rockett designed it to run off a standard negative-tip 9V feed, with a charge pump inside bumping the voltage up to 24V¹. Gearnews made the point plainly: it runs like the original vintage effect internally at 24V, but on a modern 9V power supply⁷.

The pedal runs on a 9V mains supply only, with no battery option⁹, and the adaptor is not supplied⁵¹⁰.

Analog vibe, digital reverb

The split between the two sections matters to players comparing circuits. Premier Guitar's reviewer was clear on the architecture: "Though its reverb component is digital, Uni-Verb's modulation section is not a digital facsimile." The reverb is generated by an Accutronics Digi-Log module, which the same reviewer described as "immersive, engaging and fun"⁴. Guitar.com's Richard Purvis spotted the real photocell assembly inside: four LDRs huddled around a bulb, the distinctive arrangement of the original design⁹.

Where it came from

The Uni-Verb was a five year project for J. Rockett Audio Designs, led by designer Chris Van Tassel^1121012. Van Tassel described the goal: "This was a five year project to create the most authentic Univibe pedal we could while adding modern features players wo[uld want]"¹³. Delicious Audio reported that it took the Rockett engineers five years to perfect the circuit and make it sound like the Shin-Ei/Univox original, with the vibe section made more musical and useable than the original in the process⁸.

The pedal launched in July 2022³¹³ as the second pedal in the Classic Series³, and it was available from launch at $449.00³¹³. Its enclosure is an homage to the original Uni-Vibe, with chicken head knobs and clock-style markers, in a hefty box that Premier Guitar's reviewer said feels more like a high-quality 1950s test instrument than a guitar pedal⁴. Dimensions are 4.75 x 5.25 x 1.25 inches, 2.25 inches to the top of the knob, and it weighs 2 lbs⁸¹.

What reviewers made of it

MusicRadar's verdict on the tone was direct: "It gets the classic Uni-Vibe tones right." The review credited the pedal's success to perfecting the sounds of the original '60s Uni-Vibe and of a classic spring reverb tank from the decade previous⁵. Pedal of the Day found it recreates the classic sounds you would expect, with the added spring reverb making it distinct, and noted the wider speed range as a practical plus over a vintage unit⁶.

The one recurring criticism in the coverage is the missing expression input for speed⁴. Otherwise, reviewers treated the Uni-Verb as a faithful, flexible take on the vibrato and reverb combination, closer in spirit to a vintage Uni-Vibe plus a spring tank than to a modern ambient pedal⁸.

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