J. Rockett Uni-Verb

Modulation + Reverb combo pedals have been a thing for a while now, but in most, if not all cases these are effects targeting the ambient/psychedelic guitarist, featuring long reverbs and a variety of swirly modulation options. The J. Rockett Uni-Verb – as we have come to expect by the Nashville-based company – takes this idea in a more classic direction, by marrying a Uni-Vibe-style circuit with a spring reverb.

It took the Rockett engineers five years to perfect the Uni-Vibe circuit and make it sound like the Shin-EI/Univox original. Improving on that design, they made the Vibrato/Chorus selection foot-switchable, and added a spring reverb at the end of the chain that can also be triggered via its own footswitch.

The Uni-Verb’s circuit also expands the modulation’s rate, by allowing faster and slower oscillation than the original, and increases the output, which can be controlled through a dedicated knob.

The Chorus Mix knob is deactivated in Vibrato mode, while in Chorus mode it will blend wet and dry signals. The Intensity knob applies to both effects delivering smooth modulation at lower settings and a more pronounced and even choppy effect when turned all the way clockwise.

The Reverb has two simple knobs: Dwell, controlling the effect’s length, and Reverb, setting the level.

An FX loop allows you to insert other effects between the vibe and the verb.

As always with pedals by J. Rockett, it’s all in the sound, which you can hear in the videos below. We added it to our article about the Best UniVibe Pedals.

J. Rockett Uni-Verb, Builder’s Notes

The Uni-Verb is a 5 year project to try and capture the sound of the original. To make it even better we have added a Reverb meant to emulate a classic spring tank reverb from the 50’s. It is always best to have the Uni-Verb effect first in the chain and Reverb last in the chain so we have built in a loop to allow you to do so.

The originals had a rocker switch to select either vibe or chorus but we have added a foot switch so it can be done on the fly. We paid special attention to making the vibe section very musical and useable compared to the original. The Univerb vibes faster and slower than the original and also has slightly more output.


CHORUS MIX – Use this to blend your dry signal with your wet signal. The wetter the mix the more apparent the
chorus effect is. You will find the perfect blend for your needs but don’t be afraid to go over the top. This only
controls the mix of the chorus and not the vibe.

LEVEL – Use this to control the pedal’s output level.

SPEED – Use this to control the speed of the vibe or chorus.

INTENSITY – Use this to control the intensity of the vibe or chorus. The higher up this knob is set will affect the
turnaround which can be made intense and almost choppy or subtle and smooth.


REVERB – Use this to control the intensity of the Reverb

DWELL – Use this to control the length of the Reverb trail


GUITAR INPUT – Mono input

OUTPUTS – Mono Output

POWER INPUT – The classic version of this pedal ran at 24v using a fixed power cable. We have designed the UNI-
VERB to run off of a standard (Negative tip) 9v feed but utilizing a charge pump internally to bump it up to 24v.

This way you can use your standard 9v input with no worries at all, no special cables or power supplies. You can
also use something like the Voodoo Labs linear power supply. (We have our own new PS coming soon as well)


ON/OFF (REVERB) – Engages the Reverb

ON/OFF (Chorus/Vibe) – Engages the Chorus or Vibe

CHORUS/VIBRATO – Allows you to switch between chorus and vibe on the fly
You can run the Reverb by itself or the Chorus/Vibe by itself or both together, your choice.

Weight per item – 2 lbs.

4.75?X5.25?X1.25 (2.25? to top of knob”)