The TC Electronic Viscous Vibe is a compact vibrato pedal that TC Electronic introduced in 2015 as part of its TonePrint line. TC described it as a "dead on 1:1 digital recreation of the legendary Shin-Ei Uni-Vibe," the Japanese pedal whose swirling chorus and pitch-wobbling vibrato sounds became a fixture of late-'60s and '70s guitar1. Where an original Uni-Vibe is a large, photo-cell-based unit, the Viscous Vibe packs the effect into TC's standard TonePrint enclosure with modern additions: stereo inputs and outputs, true bypass and analog dry-through1.
The pedal shipped at a list price of $129.99 in the US, with availability in May 2015 in Europe and June 2015 in the US1. Premier Guitar later described it as "a digital-modulation machine for Vibe fans on a budget"2.
A digital recreation of the Shin-Ei Uni-Vibe
The original Shin-Ei Uni-Vibe is "known for its otherworldly lush and syrupy sweet tones," as TC's product manager for guitar, Tore Mogensen, put it when the pedal was announced14. The Viscous Vibe was built to capture those tones digitally rather than with the photo-cell and bulb circuit of the vintage unit.
Guitar World's reviewer found the recreation convincing, writing that the chorus effect "is the same thick, swirling, psychedelic Uni-Vibe effect guitarists have loved since Jimi played 'Machine Gun,'" and that the vibrato effect "is spot on as well"5. The only vintage element the digital design leaves out is the noise, which the same reviewer felt most players would welcome5.
The controls
The control set is deliberately simple: three knobs and a mode switch.
| Control | What it does |
|---|---|
| Speed (large knob) | Sets modulation speed; sized so it can be operated with a foot if your pedalboard has room2 |
| Intensity | Sets how deep the effect is26 |
| Volume | Sets the output level26 |
| Mode switch (three-way) | Chorus, vibrato or TonePrint position26 |
The mode switch works the way the original Uni-Vibe's did. One side gives the commonly used "chorus" effect, a mix of dry and modulated signal; the other gives a 100%-wet vibrato, where the whole signal is pitch-modulated2. The middle position activates whatever TonePrint voice is loaded into the pedal2.
One extra performance feature: holding the footswitch activates a ramp-up sweep of the speed, a modern convenience the original never had2.
Power and connections
The pedal runs on a 9V DC supply at 100mA3, and also has a 9V battery compartment inside2. On the exterior you'll find the 9V DC jack and a USB 2.0 port used to download TonePrints2.
There is no expression input, so the speed cannot be swept with an external pedal7. The large speed knob is the only way to change modulation speed on the fly, by hand or by foot.
Inside the enclosure, DIP switches handle two routing choices: true-bypass or buffered operation, and a kill-dry function that mutes the direct signal when using the pedal in an effect loop2. The analog dry-through circuitry always passes your guitar's unprocessed dry tone, whether the pedal is engaged or not, which TC credited with zero latency and full dynamic response5.
TonePrints for the Viscous Vibe
The TonePrint position on the mode switch stores downloaded vibe effects from TC's artist library, or your own modified preset created in the TonePrint editor software5. Premier Guitar's reviewer tried three downloadable TonePrints2:
- "Vintage Vibe" smooths and de-emphasizes the low-end content that characterizes the default chorus setting2
- "Thirsty Hearts" adds a tri-chorus with similarly intense and disorienting results2
- "Space Vibe" adds a flanging effect whose intense sweeps move in subdivisions parallel to the vibe modulations2
MusicRadar's reviewer noted that at the time of their writing, TC had no available TonePrints for the pedal and it was not recognized by the editor software, though they expected that to be sorted shortly6. That was an early-availability issue; the TonePrints above were downloadable by the time of Premier Guitar's review2.
What reviewers said
Reviews across the press were positive about the sound and the value.
MusicRadar's verdict was concise: "Excellent recreation of the Uni-Vibe tone. Practical. Versatile. Good value for money."6
"The Helix and Viscous Vibe instantly blew me away with their expressive character and dynamic responsiveness."
The same Guitar World review contrasted this with most digital phasers and vibe effects the reviewer had encountered, which sounded flat and underwhelming5.
Premier Guitar's reviewer found the chorus mode could sound "throaty, vowely, heavy, and huge, especially for chords, arpeggios, and slow, liquid solo passages," with a bass-heavy coloration2. In vibrato mode, the pedal was "more organically queasy and animated than some digital vibratos I've encountered," with the slower speeds particularly effective paired with buzzing '60s-style fuzz2. The enclosure itself, TC's signature TonePrint pedal housing, felt rock-solid2.
Videos
Premier Guitar
TC Electronic
TC Electronic
Questions
Is the TC Electronic Viscous Vibe stereo?
Yes. The pedal offers a choice of stereo or mono operation, with stereo inputs and outputs among its contemporary features. You can run it into two amps for a wider spread of the chorus and vibrato effects, or keep it in a standard mono setup.
Does the Viscous Vibe have an expression input?
No. Guitar World's buying guide notes that the Viscous Vibe does not have an expression input, so you cannot sweep the speed with an external pedal. The large speed knob is sized so you can adjust it with your foot instead, if your pedalboard has room.
Is the Viscous Vibe true bypass or buffered?
Both are options. The pedal ships with true bypass, but internal DIP switches let you choose buffered bypass instead. It also uses analog dry-through circuitry, so your unprocessed dry tone is always passed through, whether the pedal is engaged or not.
What does the kill-dry switch on the Viscous Vibe do?
It is an internal DIP switch that mutes the direct signal, which is useful when you run the pedal in an effect loop. With kill-dry engaged, only the wet vibe signal passes to the output, preventing the direct tone from doubling up with the loop's dry feed.
Sources (7)
- TC Electronic Launches Viscous Vibe & Helix Phaser, Premier Guitar, 2015-01-21
- TC Electronic Viscous Vibe Review, Premier Guitar, 2015-06-28
- TC Electronic Viscous Vibe, Pedal of the Day, 2015-11-04
- NAMM 2015: TC Electronic Announces Viscous Vibe Pedal, Guitar World, 2015-01-23
- Review: TC Electronic Helix and Viscous Vibe Pedals, Guitar World, 2015-08-24
- TC Electronic Viscous Vibe review, MusicRadar, 2015-06-15
- Best pedals for blues: overdrives, reverbs and more, Guitar World, 2022-06-24
