The Wetter Box is a parallel effects blender from TheGigRig, the UK pedalboard switching specialists. It holds two effects loops and lets you run two pedals, or two chains of pedals, at the same time, blending their outputs together with one large central knob instead of feeding them in series. It was announced in May 2019 at £24912 and is based on the brand's 2006 Wet Box, which worked similarly but on a much simpler scale3.
What it does for your rig
Running effects in parallel changes how they combine. Instead of one pedal feeding the next, both loops receive your guitar's signal at once and their outputs are mixed, so a delay can sit alongside a distortion rather than smearing behind it. The Wetter Box was designed for exactly this: you connect effects to it via mono or stereo and blend them with the central knob3. Guitar Pedal X's Stefan Karlsson called it "an excellent Full Stereo (TRS) Parallel Blender", noting that everything can be stereo, including the main path4, and that it can blend several channels in stereo and even output to a Wet-Dry-Wet rig6.
The unit also has internal voltage doubling for greater headroom5, which matters when hotter signals hit the loops.
The controls
| Control | What it does |
|---|---|
| Central blend knob | Blends the two effects loops together15 |
| Per-loop gain controls | Dedicated gain control for each of the two loops13 |
| Mode selector | Chooses between Blend and Mix operation3 |
| Phase switch | Inverts the return of loop B to mitigate phase issues3 |
| Bypass option (loop B) | True bypass or trails bypass1 |
| Expression input | Accepts an external expression pedal5 |
| Remote switch input | Accepts a remote footswitch5 |
The two modes behave differently. According to TheGigRig, Blend "crossfades loop A with B", sweeping smoothly from one loop to the other, while Mix "adds loop B to Loop A", layering the second loop on top of the first3.
The phase switch applies to loop B only. When blending two effects in parallel, phase issues can occur between the two signals, and the switch lets you correct for that5.
Expression and remote control
The blend does not have to be set by hand. "The Wetter Box can also be used with an expression pedal or remote footswitch, if you so choose," Guitar.com reported at launch3, and gearnews.com confirmed inputs for both an external expression pedal and a remote footswitch5. For a player, that means the parallel mix can be swept live, riding a delay into a chorus or back, without bending down mid-song.
How it compares
Stefan Karlsson, comparing parallel blenders for Guitar Pedal X, placed the Wetter Box alongside the Cosmic Loop FX Parallelarator: the Parallelarator has 3 loops compared to the Wetter Box's 2, and both devices have a phase inverter on one of their loops4. Against the ADDAC Systems Mixology, Guitar.com's Ed Oleszko found the Wetter Box "offers similar mixing of two pedals or chains of FX, offers stereo ins and outs and Expression control but both of these" lack the Mixology's feedback controls2.
Background and availability
Videos
Pete Thorn
TheGigRig
AndyDemos
Questions
What is the difference between Blend and Mix mode on the Wetter Box?
The Wetter Box has two main modes of operation. According to TheGigRig, Blend mode crossfades loop A with loop B, so the central knob sweeps smoothly from one effect to the other. Mix mode adds loop B to loop A, so both effects run together and the knob sets how much of loop B is mixed in.
Does the Wetter Box have true bypass?
Loop B can be set to either true bypass or trails bypass. Trails bypass lets time-based effects such as delay or reverb repeats fade out naturally after the loop is switched off, while true bypass removes the loop from the signal path entirely.
Can the Wetter Box be used in stereo?
Yes. It is a full stereo (TRS) parallel blender with a pair of TRS effects loops that work with both mono and stereo effects. Guitar Pedal X's Stefan Karlsson notes it can blend several channels in stereo and even output to a Wet-Dry-Wet setup.
What does the phase switch on the Wetter Box do?
The phase switch affects the return of loop B. When two effects are blended in parallel, their signals can arrive out of phase and partially cancel each other. Flipping the phase switch inverts loop B's return to mitigate those phase issues.
Can I control the Wetter Box with an expression pedal?
Yes. The Wetter Box has an input for an external expression pedal, and it can also be used with a remote footswitch. That means the blend can be swept by foot during a performance rather than only by hand.
How is the Wetter Box different from the Mixology?
Guitar.com's Ed Oleszko found the Wetter Box offers similar mixing of two pedals or chains of effects, with stereo ins and outs and expression control, but that it lacks the ADDAC Systems Mixology's feedback controls.
Sources (6)
- TheGigRig's Wetter Box aims to create epic tones by blending effects in parallel, MusicRadar, 2019-05-24
- ADDAC System Mixology review: a clever problem solver, Guitar.com, 2026-05-25
- TheGigRig elevates parallel effects mixing with Wetter Box, Guitar.com, 2019-06-04
- Guitar Pedal X, Guitar Pedal X, 2025-03-11
- GigRig Wetter Box: Blend effects pedals in parallel, gearnews.com, 2019-05-27
- Guitar Pedal X, Guitar Pedal X, 2025-10-31
