The Dedalo Fx Revolver is an analog overdrive pedal with a built-in booster, made by Dedalo Fx, an Argentine brand of pedals1. The current version is the 2015 model RVO3, the third version of the circuit1. Its circuit is built around MOSFETs, but not in the usual diode-clipping configuration found in many overdrives: Dedalo Fx uses the MOSFETs as amplification elements with carefully chosen cutoff frequencies, which the maker credits with a wide range of natural overdrive1.
The two halves of the pedal work independently. The overdrive side covers a range of gain, and the maker describes it as behaving very much like a tube amp: you can set a low gain and push it with the booster, or let the drive stage generate the gain by itself1. With the Drive turned up, Dedalo Fx says the Revolver produces a very warm, straightforward overdrive, and that engaging the booster with up to 20dB of gain yields a classic lead guitar sound with long sustain1. The booster is an independent circuit with input and master gain stages2, so it also works on its own as a straight boost pedal into a tube amp.
The controls
The Revolver has five knobs and two footswitches. The knob layout reflects the two-stage design: Level, Drive and Treble shape the overdrive side, Gain sets the booster, and Master handles the combined output1.
| Control | What it does |
|---|---|
| LEVEL | Output level of the overdrive when the booster is not engaged1 |
| DRIVE | The amount of overdrive; set it low and push with the booster, or use it to generate the gain by itself1 |
| TREBLE | Treble control: right for an open, bright tone, left for a darker sound1 |
| GAIN | Gain applied by the booster; a stronger signal into the overdrive circuit gets more saturation and sustain out of it1 |
| MASTER | Output level of the overdrive when the booster is engaged, letting you raise the output while boosting the input to further drive the amp or hit a lead level1 |
The two footswitches are both true bypass. The OVERDRIVE switch turns the overdrive on and off, and the BOOSTER switch turns the booster on and off, each leaving your signal untouched when disengaged1.
Pedal of the Day, reviewing the RVO-3 during March 2017, walked through the same layout from a player's angle. On the overdrive side, "Drive sets the amount of overdrive" and "Level is your output control," while Treble "has a great range, and even when turned towards the dark side," it does not get too muddy3. On the booster side, they noted the Gain control is only in use when the booster is active, and that the Master knob "sets the output of the Revolver when BOTH sides are engaged at once, allowing for perfect volume control" across the drive and boost functions3.
"Ranging from a lovely slight boost of your amp to a raging, overdrive-infused sonic throw down, the Revolver is an excellent addition to any rig."
How the booster and overdrive interact
Because the booster sits ahead of the overdrive circuit, the Gain control does two jobs at once. It raises your overall level, and it hits the overdrive stage harder, which the maker says pulls more saturation and sustain out of the circuit1. The Master control then sets the final output when both sides are on, so a lead patch can be louder than your rhythm sound by exactly as much as you dial in1.
This is also what separates the Revolver from a single-knob boost stacked in front of a separate overdrive: the Level and Master controls give you two output settings, one for the overdrive alone and one for overdrive plus boost, matched within the same box1. If you are weighing it against other gain pedals, the overdrive, distortion and fuzz families each work differently, and the Revolver sits on the overdrive side of that line with the booster as an extra stage.
Power and practical details
The Revolver runs on a 9V DC center negative supply and draws 10mA1, figures RockBoard's PedalPedia listing for the RVO-3 confirms2. It also accepts a 9V alkaline battery1. At 10mA it is a light load, easy on a multi-output power supply.
Dedalo Fx ships the Revolver from Argentina by FedEx International Priority, which the maker says takes 7 days to most places, but shipping is not available to the United Kingdom1.
Other details from the maker: the enclosure is white, measures 12cm x 9.4cm x 5.4cm, and weighs 455gr1. Input impedance is 1Mohm1. All Dedalo Fx products, the Revolver included, carry a 2-year warranty1. The list price is 125 USD plus shipping1.
Videos
dedalofx
Pedal of the Day
Sou Guitarrista
Questions
Does the Dedalo Fx Revolver run on a battery?
Yes. The maker lists 9V alkaline battery power alongside a 9V DC center negative power input. Current draw is 10mA, so a battery is a workable option, though an external supply is the usual choice on a pedalboard.
Is the Dedalo Fx Revolver true bypass?
Yes. Both footswitches are true bypass: one turns the overdrive on and off, the other turns the booster on and off, and the maker states each switch leaves your sound intact when the effect is off.
How much boost does the Revolver booster add?
Up to 20dB of gain. The Gain control sets how much the booster pushes, and a stronger signal into the overdrive circuit produces more saturation and sustain. Pedal of the Day noted the boost lets you drive a tube amp with ease while retaining your core tone.
Can the Revolver booster be used without the overdrive?
Yes. The booster is an independent circuit with its own true bypass footswitch, its own Gain control, and input and master gain stages, so it works on its own as a straight boost or stacked with the overdrive.
Where is Dedalo Fx based?
Dedalo Fx is an Argentine pedal brand. The Revolver ships from Argentina by FedEx International Priority, which the maker says takes 7 days to most places, though shipping is not available to the United Kingdom.
Sources (3)
- Revolver / Overdrive + Booster, Dedalo Fx
- Revolver RVO-3 by Dedalo FX, RockBoard PedalPedia, 2026
- Dedalo FX Revolver RVO-3 Overdrive Booster, Pedal of the Day, 2017-03-15