The JHS Pedals Warble Tron is a chorus and vibrato pedal that takes its cues from the big amps and new effects of the 1960s, with Uni-Vibe-style sounds at its core. A toggle switch selects between Chorus and Vibrato modes, so one box covers both thick, warbly Uni-Vibe-style modulation and a shimmering, watery chorus1. If you are browsing chorus pedals that also reach into vibrato, it sits in the same family as JHS's later Emperor Analog Chorus/Vibrato and Unicorn.
Controls
| Control | What it does |
|---|---|
| Speed | Oversized knob on the right; controls both Chorus and Vibrato modes, sized for foot adjustment in real time1 |
| Depth | Smaller knob, sets effect intensity1 |
| Volume | Smaller knob, tucked away on the left of the pedal1 |
| Mode toggle | Selects between Chorus and Vibrato modes1 |
The Speed knob is the pedal's stand-out feature. It was made specifically large so a player can work it with their foot while playing, adjusting the rate of the effect in real time, and it governs both modes1.
Sound and lineage
The Warble Tron is a classic take on an age gone by, based on the big amps and new effects of the 1960s era. Pedal of the Day's reviewer, Mike B, described what it covers: "Thick warbly Uni-Vibe sounds and gorgeous, shimmering, watery chorus are present." The Uni-Vibe itself, the original inspiration here, used a Chorus/Vibrato selector switch on the original pedal, a layout the Warble Tron echoes with its own mode toggle12.
On how the two modes hold up, the reviewer's verdict was that "Both shine in their own right, and can both be controlled by the over-sized Speed knob on the right."1
Videos
ProGuitarShopDemos
Chicago Music Exchange
Prymaxe
Questions
Does the JHS Warble Tron do both chorus and vibrato?
Yes. A toggle switch selects between Chorus and Vibrato modes, and the reviewer at Pedal of the Day found that both modes shine in their own right and can both be controlled by the over-sized Speed knob. The pedal is described as covering thick, warbly Uni-Vibe sounds as well as shimmering, watery chorus.
Why is the Speed knob so large on the Warble Tron?
The Speed knob is the stand-out feature of the pedal, and it was made deliberately oversized so a player can control it easily with their foot for real-time adjustment while playing. It controls both the Chorus and Vibrato modes.
Where is the Volume knob on the Warble Tron?
The Volume knob is tucked away on the left of the pedal, alongside the smaller Depth knob, which sets the effect intensity. The larger Speed knob sits on the right.
What color is the JHS Warble Tron?
The Warble Tron is a blue box, as described in Pedal of the Day's review of the pedal.
Sources (2)
- JHS Pedals Warble Tron Chorus Vibrato, Pedal of the Day, 2015-04-03
- What was the original univibe effect?, Strymon, 2015-06-30
