The JAM Pedals "Camper" RetroVibe mk.4 is a hand-painted, limited artwork version of the RetroVibe mk.4, an all-analog Uni-Vibe-style modulation pedal from Greek maker JAM Pedals. A toggle selects between Chorus, which JAM Pedals describes as the classic pulsing phase character, and Vibrato for pitch-focused movement, and the mk.4 generation adds tap tempo, speed ramping and an expression input over earlier versions12.
The Camper edition is the same circuit as the standard mk.4: JAM Pedals' own line on the artwork versions is "same sound, different artwork"345. What you are choosing with the Camper is the paint job. Every limited artwork pedal is a one-of-a-kind hand-painted piece, and the pedal you receive will differ in detail from the photos shown1.
What it does to your sound
The RetroVibe mk.4 sits in the vibrato and chorus family, but its character comes from the Uni-Vibe tradition: a slow, vocal, pulse-like modulation rather than the wider sweep of a flanger or the even swirl of a modern digital chorus. JAM Pedals describes the mk.4 as preserving "the soul of the original RetroVibe while making it far more expressive in performance"7. The LFO runs from 0.5 to 9.5 Hz, which covers everything from a slow, barely-moving throb to a fast rotary-style churn1.
The Chorus/Vibrato toggle is the big tonal decision. In Chorus you get the mixed, pulsing phase character associated with the original Uni-Vibe; in Vibrato the pitch movement is foregrounded, giving a warble without the dry signal1.
The controls
| Control | What it does |
|---|---|
| Chorus/Vibrato toggle | Selects Chorus for the classic pulsing phase character or Vibrato for pitch-focused movement1 |
| Speed | Sets modulation speed; also sets the ramp destination while holding TAP/RAMP1 |
| Depth | Sets modulation depth; also sets ramp travel time while holding TAP/RAMP1 |
| TAP/RAMP footswitch | Tap to set modulation speed; hold to ramp to a second speed1 |
| ON footswitch | Engages the effect; hold it while inserting power to toggle the power-on state1 |
| Internal Level trimmer | Sets maximum output level1 |
The TAP/RAMP footswitch is the heart of the mk.4 update. Tap it and the modulation speed locks to your tapping, so the effect can sit in time with the song. Hold it and the pedal ramps to a second speed: while you hold, the Speed knob sets where the ramp ends up and the Depth knob sets how long the travel takes1. That gives you a foot-controlled way to accelerate from a slow swirl to a fast churn, the kind of move a rotary speaker player makes with the speed switch.
An internal trimmer sets the maximum output level, useful for matching the pedal's engaged level to your bypassed signal or pushing it a little hotter1.
Expression and external tap
Two side inputs extend the control options:
- A TRS input accepts a standard passive 10 kΩ expression pedal for continuous Speed control1.
- A separate TS input accepts an external tap-tempo switch, so you can keep the effect synced from elsewhere on your board1.
Delicious Audio's coverage of the Mk4 highlighted exactly this: "The addition of a Tap Tempo footswitch (with an external input) brings essential rhythmic precision, allowing you to sync modulation speed to a song"2.
The Camper and the other artwork editions
JAM Pedals sells the RetroVibe mk.4 both as a standard model and as a series of custom artwork editions, each a one-of-a-kind hand-painted piece7. The custom artwork editions include the Camper, Fishbone, Paths, Pink Eye, Popped Art and Skin variants, which share the same sound and differ only in artwork:
| Edition | Notes |
|---|---|
| "Camper" | This page; one-of-a-kind hand-painted1 |
| "Fishbone" | Same sound, different artwork3 |
| "Paths" | Same sound, different artwork534 |
| "Pink Eye" | Same sound, different artwork3 |
| "Popped Art" | Same sound, different artwork; Paul Gilbert is listed among its players8 |
| "Skin" | Same sound, different artwork4 |
Because each is painted by hand, the pedal you receive will differ in detail from the photos on the maker's site1. If you want the mk.4 sound and do not care which painting you get, any edition is the same pedal underneath.
Where it came from and who plays it
JAM Pedals' RetroVibe line is closely associated with the Uni-Vibe circuit. RockBoard's PedalPedia describes the RetroVibe as having "long stood among the most revered Uni-Vibe interpretations ever made," and notes that the Mk.4 added tap tempo and ramping functions6.
JAM Pedals lists J Mascis of Dinosaur Jr among the RetroVibe's players, quoting him1:
"I have been using a univibe Clone since the early 90's live. The RetroVibe is right on track with the perfect sound we'v"1
(The maker's quote is truncated on the product page as shown.)
On That Pedal Show, the presenters demoed the RetroVibe Mk4 and noted its new timing feature, with one saying9:
"Anyway, this one has tap tempo."9
Buying notes
The Camper is listed by JAM Pedals at a regular price of £459.00 GBP1. For UK buyers the maker ships DDP, with 20% UK VAT and all duties included and no extra charges on delivery, and offers a 30-day money-back guarantee1. At 120 mA maximum current draw, the pedal wants a proper 9V DC center-negative supply rather than a shared low-current daisy chain1.
Videos
JAM pedals
JAM pedals
Shawn Tubbs
Questions
Is the JAM RetroVibe mk.4 true bypass?
Yes. JAM Pedals lists true bypass for the RetroVibe mk.4 and every custom artwork version, including the Camper. When the pedal is off, your signal passes through without buffering, which matters if you run long cables or a large board.
Does the RetroVibe mk.4 have tap tempo?
Yes. A TAP/RAMP footswitch sets the modulation speed when you tap it, and a separate TS input on the side accepts an external tap-tempo switch, so you can sync the effect to a song without leaning down mid-phrase.
Can you use an expression pedal with the RetroVibe mk.4?
Yes. A TRS input accepts a standard passive 10 kΩ expression pedal for continuous control of the Speed setting. Combine it with the ramping function and you can sweep between slow and fast modulation with your foot.
Is the Camper RetroVibe different in sound from the standard mk.4?
No. JAM Pedals describes the custom artwork versions, including the Camper, as the same sound with different artwork. The Camper is a one-of-a-kind hand-painted version of the identical all-analog mk.4 circuit, so only the finish differs.
Is the RetroVibe a Uni-Vibe clone?
JAM Pedals calls the RetroVibe mk.4 an all-analog Uni-Vibe-style modulation pedal, and RockBoard's PedalPedia calls the RetroVibe one of the most revered Uni-Vibe interpretations ever made. It is a maker's take on the circuit rather than a claimed copy.
Sources (9)
- "Camper" RetroVibe mk.4, JAM Pedals (jampedals.com)
- Jam RetroVibe Mk4, Delicious Audio, 2026-02-11
- "Pink Eye" RetroVibe mk.4, JAM Pedals (jampedals.com)
- "Skin" RetroVibe mk.4, JAM Pedals (www.jampedals.com)
- "Paths" RetroVibe mk.4, JAM Pedals (jampedals.com)
- RetroVibe Mk.4 “My Mind’s Room” by Jam Pedals, RockBoard PedalPedia, 2026
- RetroVibe, JAM Pedals (jampedals.com)
- "Popped Art" RetroVibe mk.4, JAM Pedals (www.jampedals.com)
- New Pedals! Keeley Nocturne, Jam Retrovibe 4, Caroline Kilo 2K, DevTech Soft Drive, Hagerman EF86, That Pedal Show (YouTube), 2026-01-30
Paul Gilbert
