The Cosmodio Gravity Well is a dual-sided analog pedal with a tremolo on one side and a wavefolder on the other. It is the second release from Cosmodio, and Premier Guitar described it as a first-of-its-kind modulation effect: when both circuits are active, a third effect emerges, a refractor, produced by the two channels interacting1. Guitar Pedal X's Stefan Karlsson summed up the concept as a pedal that "combines wavefolding distortion with multi-waveform amplitude tremolo in independent channels"2.
A wavefolder is a circuit borrowed from analog synthesizers: instead of clipping a signal off when it gets loud, it folds the waveform back on itself, adding harmonics and a synth-like edge. On its own that gives you a distinctive distortion flavor; combined with the tremolo's amplitude modulation, the two circuits shape each other in ways neither does alone.
What the Gravity Well does to your sound
Each side works on its own. The tremolo channel is an amplitude tremolo with eight LFO waveforms, so the character of the volume pulse can go from a smooth sine to stepped sample-and-hold or random movement2. The wavefolder channel adds the folding distortion, with gain, tone and volume controls plus three voice configurations3.
Run both channels at once and the tremolo's modulation is applied to a folded waveform, which is where the refractor comes in. Pedal of the Day called it "a first-of-its-kind style of modulation effect" produced by the two circuits working together3. The sounds the reviewer pulled out of it ranged widely:
- Analog synthesizer sounds
- Touch sensitive envelope filter-esque sweeps
- Heavy cinematic pulsing rhythms
- Splatty gnarly alien fuzz
- Ring mod like bell tones
- Science fiction sound fx and textures
- Surfy tremolo warbles3
That list is the reviewer's own description of what the pedal produces, not a maker's claim, and it gives a fair picture of where the Gravity Well sits: closer to experimental synth textures than to a classic amp-style tremolo3.
The controls: two channels, eight waveforms and two footswitches
The pedal has a five-knob control set plus selectors, with a footswitch for each channel so you can bring either side in and out independently12.
Tremolo channel
| Control | What it does |
|---|---|
| Depth | Sets tremolo modulation depth2 |
| Speed | Sets tremolo modulation speed3 |
| Waveform | Sawtooth, Ramp Up, Square, Triangle, Sine, Swoop, Sample-and-Hold, Random2 |
| Flow | Trem into Wavefold, or Wavefold into Trem2 |
| Tremolo footswitch | Engages the tremolo channel2 |
Wavefolder channel
| Control | What it does |
|---|---|
| Gain | Sets wavefolder gain2 |
| Volume | Sets wavefolder output level12 |
| Tone | Dark, Balanced, Bright2 |
| Voice | Focused, Full Range, Clean-Blended2 |
| Wavefolder footswitch | Engages the wavefolder channel2 |
The Flow selector answers a question players ask about any two-effect pedal: which side comes first? On the Gravity Well you choose, either tremolo into the wavefolder or wavefolder into the tremolo2. The FLOW control also changes the relationship between the tremolo and wavefolder in refractor mode3.
The external jack handles tap tempo for modulation speed, or an expression pedal controlling speed or depth mid-performance13. Karlsson's practical tip for getting musical results out of the combination:
"The skill here is going to be in balancing up the Volume of the Wavefolder with the Depth of the Tremolo - for optimal musical output."2
Power, bypass and where it is made
The Gravity Well runs on 9-volt operation via an external power supply and has no battery compartment, so it needs a spot on a powered board1. The bypass is user selectable between true bypass and buffered bypass, so it can sit at either end of a signal chain depending on your setup1. It is built in the US1, and the faceplate artwork is by GOLDSUIT3.
The Gravity Well is still in its pre-order phase, with only limited demos available so far, so check the maker's power requirements before wiring it into your board.
Where it came from and what it costs
Cosmodio announced the Gravity Well in October 2024 as their second release, following the Pet Yeti Distortion Fuzz13. It was available for pre-order from the Cosmodio Instruments webstore at cosmod.io, with full launch and shipping due November 19, 202412. The Gravity Well carries a $279 street price1; during the pre-order phase it was also listed at £279 GBP2.
What reviewers said
Premier Guitar's reviewer, writing after the launch, was enthusiastic:
"Gravity Well is the most fun I've had with a modulation pedal in a while."5
The same review found it "strikes a brilliant balance between adventurous and useful" overall5. Pedal of the Day went further on the creativity angle:
"This is one of those effects that forces you to rethink the way you approach music creation, adding new ideas and sounds"3
Karlsson at Guitar Pedal X, comparing it with the Kinotone Sparks, found the Gravity Well "a far more straightforward effect and seems pretty intuitive to me," while concluding it is "one for sonic adventurers for sure!"2
The pedal also appeared on That Pedal Show in an episode covering six pedals, with the Gravity Well introduced at 23:10, the wavefolder discussed at 24:55, and sounds from 25:556.
Videos
Cosmodio
Cosmodio
Cosmodio
Questions
Does the Cosmodio Gravity Well take a battery?
No. The Gravity Well has no battery compartment and runs on 9-volt operation via an external power supply, so you will need a power supply on your board to use it.
Is the Cosmodio Gravity Well true bypass?
It is user selectable between true bypass and buffered bypass, so you can choose whichever suits your pedalboard. True bypass keeps the pedal out of the signal path entirely when off, while buffered bypass keeps a buffer in the chain.
Does the Gravity Well have tap tempo?
Yes. The pedal has an Expression Pedal/Tap Tempo input, described as an external control jack for tap tempo control of modulation speed, or expression pedal control of speed or depth.
Can you put the wavefolder before the tremolo on the Gravity Well?
Yes. The Flow selector on the tremolo channel offers two signal paths: Trem into Wavefold, or Wavefold into Trem. The order of the two channels is yours to choose.
How much does the Cosmodio Gravity Well cost?
The Gravity Well carries a $279 street price, and it was also listed at $279 for pre-order from the Cosmodio Instruments webstore. During the pre-order phase it was additionally listed at £279 GBP.
Where is the Cosmodio Gravity Well made?
It is built in the US. It is the second release from Cosmodio, following the Pet Yeti Distortion Fuzz, and the faceplate artwork is by GOLDSUIT.
Sources (6)
- Discover the Psychedelic Sounds of Cosmodio's Gravity Well, Premier Guitar, 2024-10-16
- Guitar Pedal X, Guitar Pedal X, 2024-10-17
- Cosmodio Instruments Gravity Well Analog Wavefolder, Tremolo & Sonic Refractor, Pedal of the Day, 2024-11-19
- Cosmodio Instruments Glitch Witch Analog Auto-Modulated Logic Fuzz, Pedal of the Day, 2025-06-03
- Cosmodio Gravity Well Effects Review, Premier Guitar, 2024-12-11
- Six Pedals To LOVE! Soldano, Jam, Aqua Audio, Beetronics, UAFX, Cosmodio, That Pedal Show, 2025-10-31
