The Mythos Argo Boost Deluxe is a two-in-one pedal: a full-range clean boost and a blendable octave fuzz in one box, built by Mythos Pedals in collaboration with That Pedal Show. It grew out of the original Mythos Argo octave fuzz, keeping the same circuit topology but adding a dedicated Boost footswitch and red Boost knob so the boost side can be used on its own1.
Mythos frames the design as a change of lanes rather than a bolted-on booster. As the maker put it to MusicRadar2:
"Instead of pairing a new booster inside this new pedal, think of it as changing lanes inside the pedal2."
The result is what Mythos calls a pair of gain stages that sit well in front of a drive pedal or a drive amp: the boost raises the overall push, and the FUZZ footswitch unleashes the full Argo octave fuzz sound1. That Pedal Show, which developed the pedal with Mythos founder Zach Broyles, describes it as "a two-in-one full-range boost and blendable octafuzz effect for guitar"3.
An octave fuzz with a footswitchable clean boost
The core idea is that the two halves of the pedal can be balanced against each other. The Blend control lets you mix the octave fuzz with the clean signal, from a very subtle amount of octafuzz through to what That Pedal Show calls "full-on, fuzzed out octa mayhem"3. The boost side, the red knob and right-hand switch, is a full-range boost that can lift a clean tone into a clean amp, push other pedals or a dirty amp for extra overdrive and distortion, or run as an always-on boost3.
With the Fuzz and Blend controls set to minimum, the circuit functions as what Mythos calls "a very useful and musical sounding" booster4. Gearnews made the same point from the player's side: with the fuzz control set nice and low, the Argo Boost Deluxe acts as a handy booster pedal5.
The pedal carries two footswitches. The FUZZ footswitch brings in the full Argo octave fuzz sound4, while the master On/Off footswitch on the right engages and bypasses the pedal1. The additional Boost footswitch and red Boost knob let players use the boost portion of the circuit by itself1.
The controls
Mythos lists four dials and two footswitches on the pedal2. The control set breaks down like this:
| Control | What it does |
|---|---|
| Boost | Adjusts the output when Fuzz mode is inactive1 |
| Fuzz | Sets the amount of octave fuzz5 |
| Blend | Mixes the octave fuzz with the clean signal, from subtle to full-on3 |
| FUZZ footswitch | Unleashes the full Argo octave fuzz sound4 |
| On/Off footswitch | Master on/off switch1 |
Inside the pedal there are two internal settings to tweak the overall brightness of the boost3. The main one is the HIGHS switch.
The HIGHS switch
The HIGHS switch is an internal toggle that adds tonal possibilities to the boost mode. Mythos says the small switch, when engaged, adds a fine amount of high-end sparkle to your signal when using Boost mode, and that it is not part of the octave fuzz sound4. The pedal ships stock with the HIGHS switch off4.
The switch exists because of the collaboration. It was added after Mick Taylor of That Pedal Show expressed interest in making the boost portion a little brighter overall4. That Pedal Show describes it as a set-and-forget brightness boost switch for the boost side, useful with a darker sounding guitar or amp, or when you simply want things brighter3.
History: from the Argo to the That Pedal Show version
The Argo Boost Deluxe traces back to the original Mythos Argo324. The original Argo is inspired by the Prescription Electronics COB fuzz box, which Mythos calls "now legendary," and pushes it in a slightly more aggressive direction6. Premier Guitar, reviewing the Argo, noted the lineage plainly:
"It's inspired by the Prescription Electronics C.O.B. (Clean Octave Blend), so the control set is similar7."
Guitar World quotes Mick Taylor saying he had used various versions of the Argo, which was based on the Prescription Electronics COB8. Taylor brought the concept for the Deluxe to Mythos, and the manufacturer was excited to derive more from a circuit that so many players already knew8. That Pedal Show describes the resulting pedal as a collaboration with Zach and the team at Mythos Pedals, an evolution of the much-loved Argo3.
At its core, the Argo Boost Deluxe is the same topology as the Argo, itself a tweak on the COB circuit4. MusicRadar's take on what changed: the Deluxe takes the original and makes it more configurable and more practical2.
The pedal was announced in late March 2025 and entered production that same month3. A "Proto Enclosure" version was also sold, built in the boxes Mythos initially planned to use before switching to a bent metal enclosure; internally it is the same circuit4.
Published prices at launch disagree. MusicRadar reported the Argo Boost Deluxe available at $/£2292, Guitar World listed it at £183 (approx $236)8, and Gearnews gave $268.00 / £241.00 / 279.00€5.
Guitar World's overall verdict called it "an intriguing twofer," pairing octave fuzz and boost tones in one unit8.
Videos
That Pedal Show
ToneBros
Alex Zietë
Questions
Can the Argo Boost Deluxe be used as just a boost?
Yes. The additional Boost footswitch and red Boost knob let you run the boost portion of the circuit by itself, and with the Fuzz and Blend controls set to minimum the pedal functions as a booster. That Pedal Show describes the boost side as a full-range boost that can lift a clean tone, push other pedals or a dirty amp, or sit always-on.
What does the HIGHS switch on the Argo Boost Deluxe do?
It is an internal switch that adds a fine amount of high-end sparkle to the boost mode only, not the octave fuzz sound. It was added after Mick Taylor of That Pedal Show wanted the boost a little brighter overall. The pedal ships with the HIGHS switch off.
What is the difference between the Argo and the Argo Boost Deluxe?
The Argo Boost Deluxe uses the same circuit topology as the original Argo, but adds a dedicated Boost footswitch and red Boost knob so the boost side can be used on its own, plus an internal HIGHS brightness switch. MusicRadar described it as taking the original and making it more configurable and more practical.
Is the Mythos Argo Boost Deluxe true bypass?
Yes. Mythos Pedals lists True Bypass Switching among the pedal's specifications on its product page.
What circuit is the Mythos Argo based on?
The original Argo is a tweak on the Prescription Electronics COB, the Clean Octave Blend fuzz box. Premier Guitar notes the control set is similar to the C.O.B. because of that lineage, and Mythos says the Argo pushes the circuit in a slightly more aggressive direction.
Sources (8)
- Argo Boost Deluxe, Mythos Pedals
- “Instead of pairing a new booster inside this new pedal, think of it as changing lanes inside the pedal”: Mythos and That Pedal Show team up for the Argo Boost Deluxe, MusicRadar, 2025-04-01
- Argo Boost Deluxe, That Pedal Show, 2025-03
- Argo Boost Deluxe "Proto Enclosure", Mythos Pedals
- Argo Boost Deluxe: Mythos Collab with That Pedal Show, gearnews.com, 2025-03-28
- Argo Octave Fuzz, Mythos Pedals
- The Fuzz Boxes That Fuel PG Staff’s Meanest Musical Moments - Premier Guitar, Premier Guitar, 2025-05-12
- That Pedal Show & Mythos debut Argo Boost Deluxe pedal, Guitar World, 2025-03-28
