The Mythos Argonaut Octave Up is an analog octave-up pedal from Mythos Pedals, a small effects maker. It shifts the guitar's signal up one octave, and it does so with no controls at all: one footswitch, one fixed sound. Mythos describes it as "a no frills pedal offers a clean-ish octave up sound," and notes that used alone it is "gnarly and funky," while combined with overdrive or fuzz it produces iconic octave tones12.
The circuit works through a pair of hand matched NOS (new old stock) germanium diodes, which RockBoard's PedalPedia says gives the most prevalent octave-up effect, one that can be heard up and down the guitar neck2.
How it sounds and how it is used
Because there are no knobs, the player's control over the Argonaut comes from what is around it. Mythos suggests placing it after a fuzz pedal but before an overdrive: "We like the Argonaut after a fuzz pedal but before an overdrive"1. The same placement advice appears in Delicious Audio's write-up of the pedal3.
Reviewers have framed it the same way. In Delicious Audio's buying guide to octave pedals, Griffin Jennings wrote that "the Argonaut creates a no-frills analog octave up with a gnarly ring-mod-like tone to it," calling it cool on its own as a unique effect and perfect for stacking with other fuzzes and dirt pedals4. Paolo De Gregorio, reviewing the pedal for the same site, described it as "a no-frills, no-knobs analog octave-up pedal" designed for creating an octave fuzz with other dirt pedals3.
"The Argonaut is a no frills pedal offers a clean-ish octave up sound. Using it alone offers you a gnarly, ring mod-esque" tone.
Power and practical notes
The Argonaut runs on 9V DC with center negative polarity and draws 10 mA, so it sits comfortably on a standard pedalboard power supply2.
The pedal has no battery compartment mentioned by the maker and no tone or level controls, so its output level and voice are fixed. Players who want to blend or shape the octave do so with the pedals before and after it in the chain.
Where it sits among octave pedals
Most octave and pitch pedals offer a range of intervals, tracking controls or blend knobs. The Argonaut is narrower by design: a single octave-up voice, analog rather than digital, aimed at players who want the classic octave-fuzz stacking sound rather than a polyphonic pitch shifter. For a wider view of the category, see Octave & Pitch Pedals, and for the pedals Mythos recommends pairing it with, see Fuzz Pedals and Overdrive Pedals32.
Videos
Mythos Pedals
Mythos Pedals
Mythos Pedals
Questions
Does the Argonaut have any controls?
No. The Argonaut is a no-knobs pedal: it has a single footswitch and one fixed octave-up sound. Mythos describes it as a no-frills pedal with a clean-ish octave-up voice, and Delicious Audio's Paolo De Gregorio called it a no-frills, no-knobs analog octave-up pedal. Players who want to shape the effect do it by stacking it with fuzz, overdrive or other dirt pedals rather than by turning knobs.
Where should the Argonaut go in a pedal chain?
Mythos suggests placing the Argonaut after a fuzz pedal but before an overdrive. The maker says the pedal is cool on its own and produces iconic octave tones when combined with overdrive or fuzz, so the intended use is stacking it with dirt pedals to build an octave-fuzz sound.
Sources (4)
- Argonaut Octave Up, Mythos Pedals
- Argonaut by Mythos Pedals, RockBoard PedalPedia, 2026
- Mythos Argonaut Octave Up, Delicious Audio, 2023-02-17
- The Best Octave Pedals In 2024, Delicious Audio, 2024-08-08
