Seamoon FX Octatron

The Seamoon FX Octatron is a bass octave pedal, built as an all analog design. It generates notes below what you play, with a control that sets the effect one or two octaves down, plus a Sub function and a mix control for blending the low end against your clean signal. Seamoon FX describes it as the pedal for everything "from deep dub to smooth grooves."¹

Controls and features

The Octatron keeps its control layout focused on the low end:

One/Two Octave Down Control: sets the generated octave either one or two octaves below your playing¹
Mix Control: blends the octave effect with your clean bass signal¹
Sub Function: an additional low end feature listed by the maker¹

Design and background

Seamoon FX specifies the Octatron as an all analog pedal, so the octave and sub harmonics are produced in the analog domain rather than by digital processing.¹ The pedal comes in what the maker calls a Groovy Yellow Finish.¹

The Octatron is made by Seamoon FX, a maker of bass oriented pedals whose range also includes the Seamoon FX Grind Machine.² Seamoon describes the pedal in bass first terms: "From deep dub to smooth grooves, the Octatron is the magical box for all things bass."³

Price and availability

Seamoon FX lists the Octatron at $199.00 USD on its product page.² For more pedals in this family, see Octave & Pitch Pedals and Bass Pedals.

Videos

**Seamoon FX Seamoon Funk Machine, Octatron, Sky Machine & Grind Machine Demos | NAMM 2022**
Premier Guitar

**Seamoon FX's Grind Machine & Octatron Demo | PG Plays**
Premier Guitar

**THE NEW KING OF OCTAVER PEDALS! -- Seamoon Octatron**
BassTheWorld.com

Questions

Is the Seamoon Octatron analog or digital?

Seamoon FX describes the Octatron as an all analog design. That means the octave and sub harmonics are generated in the analog domain rather than by digital processing, which is the traditional approach for bass octave pedals and the approach players usually mean when they talk about a classic tracking octave circuit.

Can the Octatron go one or two octaves down?

Yes. The Octatron has a one/two octave down control, so you can set the generated sub octave either one octave or two octaves below the notes you play. Combined with the mix control, that lets you blend the low octave against your clean bass signal to taste.

What does the Sub function do on the Octatron?

The Octatron includes a Sub function on top of its octave down control. Seamoon FX lists it as a feature of the pedal, giving players an additional low end option alongside the one or two octave down setting and the mix control.

Sources (3)

Octatron, Seamoon FX, 2026-10-07
Grind Machine, Seamoon FX, 2026-10-07
Seamoon FX Funk Machine & Octatron, premierguitar.com, 2022-06-04