J Rockett Uni-Verb

The J. Rockett Audio Designs Uni-Verb is a Uni-Vibe pedal with a spring reverb built into the same enclosure. The vibe side is a photocell analog circuit based on the original 1960s Uni-Vibe, and the reverb side emulates a classic spring tank, with the two effects usable together or independently¹. It was announced in July 2022 as the second pedal in J. Rockett's Classic Series, after five years of development, at a list price of $449²³. MusicRadar's launch coverage gave a higher launch figure of $529².

A Uni-Vibe and spring reverb in one enclosure

J. Rockett describes the Uni-Verb as a "painstakingly accurate photocell analog vibe" based on the original Uni-Vibe pedal, with a spring reverb added¹. Inside, the vibe circuit follows the vintage design: Guitar.com's reviewer found "that distinctive arrangement of four LDRs huddled around a bulb like cowboys gazing into a campfire," the light-dependent-resistor arrangement that gives the original its characteristic swirl⁶. The reverb side is digital, generated through an Accutronics Digi-Log module rather than a physical spring tank³.

The pedal offers the original's two modulation modes. Vibrato is a fully wet signal, while Chorus blends dry and wet signal, as on the vintage unit⁷. The enclosure is styled as an homage to the original Shin-ei Uni-Vibe, with a gray steel casing, black control panel, chicken head knobs and "clock" position markers⁶³. Guitar.com notes the format matches J. Rockett's Clockwork Echo: a wide enclosure with three footswitches, four small knobs in the middle and two larger ones near the edges, with all the jacks along the top⁶.

The controls and footswitches

There are three footswitches: one engages the reverb, one toggles between Vibrato and Chorus, and one is the bypass for the modulation⁷. The original Uni-Vibe selected its two modes with a rocker switch; here that selection is footswitchable, so you can change modes mid-performance⁵⁸.

There is also an internal trimpot for adjusting the vibe's tone⁶. One limitation worth knowing: there is no expression pedal option for the rate, which Premier Guitar's reviewer found makes the pedal "a little less" flexible in function than it might otherwise be³.

Using the vibe and reverb separately

A send and return loop sits between the Uni-Vibe side and the reverb, so the two effects can be used as individual pedals, placed at different points in a pedalboard chain, or run together⁷. The loop also lets you put drives, fuzzes or other effects between the vibe and the reverb, which is a common arrangement for players who want fuzz into a Uni-Vibe¹⁰. As Premier Guitar's demo put it, you can use the two effects individually or simultaneously⁸.

History: a five-year project

The Uni-Verb was a five-year project for J. Rockett. Chris Van Tassel, the project lead, described the goal: "This was a five year project to create the most authentic Univibe pedal we could while adding modern features players would want"¹¹. Delicious Audio reports it took the Rockett engineers those five years to perfect the circuit and make it sound like the Shin-Ei/Univox original, while making the vibe section more musical and useable than the vintage unit⁵.

The pedal runs internally at 24 volts, like the original vintage effect, but accepts a modern 9V supply: a charge pump inside the pedal bumps the standard 9V feed (negative tip) up to 24V⁵¹². There is no battery option; it is powered by a 9-volt supply only⁶.

What reviewers said

Reviews were positive about the core modulation sound. MusicRadar's verdict: "It gets the classic Uni-Vibe tones right"⁴. Guitar World's Trevor Curwen went further:

The Guitar World review found the Uni-Verb convincing as a Uni-Vibe-style pedal, concluding that "As a Uni-Vibe clone this is the real deal, and if you want that particular form of modulation in all of its gloopy glory" then you'll find it here in extended form⁷. The same review noted that the Vibrato mode is a fully wet signal, while Chorus incorporates a blend of dry and wet⁷.

Premier Guitar's reviewer found the reverb, generated via the Accutronics Digi-Log module, "immersive, engaging and fun," while noting the missing expression pedal option as a functional drawback³. Delicious Audio's Paolo De Gregorio observed that the Uni-Verb takes the modulation-plus-reverb combo idea in a more classic direction than the ambient and psychedelic-targeting combos that came before it⁵.

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