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Electro-Harmonix XO Octave Multiplexer

^# 28

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$69.00 Price Tier: Budget

4.0 (55)

4 Reviews

This product is Vintage or Discontinued

Find out who is using Electro-Harmonix XO Octave Multiplexer

1 community setup

32 wishlisted

125 saved

Page last updated Jul 05, 2026

Pricing and availability

We compare 600+ stores and found this item at 1 store. Prices updated July 4, 2026.

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Price

4.0 (35)

$69.00 9 available Used

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Average Price: $99

Budget/Beginner

$100

$301+

Price Tier

In the Harmonizer & Octave Effects Pedals category, Electro-Harmonix XO Octave Multiplexer is priced in the Budget/Beginner range. This is great gear to get started with or for creators on a budget.

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High-end

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Description

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Introducing the Electro-Harmonix XO Octave Multiplexer, your one-stop solution for limitless sub-octave potential. Whether you're a solo artist seeking a richer sound or an experimental musician pushing sonic boundaries, this compact pedal is ready to amplify your artistic expression. Unleash your creativity with its monophonic signal-dropping feature, capable of generating deep bass sounds from nearly any instrument. Its revamped design in a smaller, more efficient enclosure, also known as the XO version, makes it an ideal companion for musicians on the go.

Key Features:

Offers a wide range of sub-octave possibilities
Ideal for solo artists and experimental musicians
Ability to drop any monophonic signal an octave
Can create bass sounds from virtually any instrument
Smaller, more recent XO version for enhanced portability

Product specs

Brand	Electro-Harmonix
Model	Octave Multiplexer Analog Sub-Octave Generator (XO)
Finish	Silver / Black
Year	2007 - 2021
Categories	Octave and Pitch-Shifting Pedals

FAQs

Does the Electro-Harmonix XO Octave Multiplexer work well with both guitar and bass?: Yes, the Electro-Harmonix XO Octave Multiplexer is designed to work effectively with both guitar and bass, providing rich sub-octave tones that enhance the depth and fullness of your sound.
What power supply does the Electro-Harmonix XO Octave Multiplexer require?: The Electro-Harmonix XO Octave Multiplexer requires a standard 9V DC power supply, which is common for many guitar pedals, or it can be powered by a 9V battery.
How does the Electro-Harmonix XO Octave Multiplexer differ from other octave pedals?: The XO Octave Multiplexer offers unique analog sub-octave generation, allowing users to blend sub-octave tones with their original signal and customize the sound using its filter controls for more versatile tonal shaping.
Can the Electro-Harmonix XO Octave Multiplexer be used for live performances?: Yes, the Electro-Harmonix XO Octave Multiplexer is well-suited for live performances, offering reliable tracking and robust construction, making it a great choice for musicians looking to add dynamic octave effects on stage.
What are the main controls on the Electro-Harmonix XO Octave Multiplexer?: The Electro-Harmonix XO Octave Multiplexer features controls for Blend, Sub, and Filter, allowing users to adjust the mix of the octave effect, the intensity of the sub-octave, and the tonal characteristics of the output.

Videos

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ProGuitarShopDemos

Electro Harmonix Octave Multiplexer

ProGuitarShopDemos

Electro-Harmonix Octave Multiplexer Analog Sub Octave Generator (Demo by Dan Miller)

EHX

Electro-Harmonix Octave Multiplexer Effects Pedal Demo - The Perfect Guitar

theperfectguitar

Electro Harmonix Octave Multiplexer Analog Sub-Octave Generator | Gear4music demo

Gear4music Guitars

EHX - Octave Multiplexer

Bass Stuff

Electro-harmonix Octave Multiplexer

The Autumn Trap

ELECTRO HARMONIX EHX OCTAVE MULTIPLEXER BASS DEMO

Bassklasse

Electro Harmonix Octave Multiplexer Quick Demo

Muzak Shack

Reviews

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PROS

Lush old-school analog octaver with nuanced filter controls
Excels after a fuzz pedal for an amazing sound
Offers High and Bass Filter settings for precise sound shaping
Fun to play with, capable of producing bass on a guitar
More organic sounding compared to digital pedals
Unique "grungy broken speaker sound" achievable
Can produce special effects with velcroey bass and clanging high harmonics

CONS

Poorly tracks dropped D string and some other notes
Prone to odd sound artifacts due to analog design
Clangy, unnatural timbre not suitable for all musical styles
Described as a "tonesucker" by some, affecting tone quality negatively
Not ideal for playing chords; produces odd wahing effects

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Electro-Harmonix XO Octave Multiplexer.

Features and functionality

0 0

The pedal suffers from a volume drop when blend is set between 40-60%, impacting the ability to achieve a balanced octave/dry mix.
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0 0

The absence of a high octave limits versatility, especially for bass applications.
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0 0

The low/high filters allow for diverse sound shaping, but a volume control would enhance usability by managing significant cuts or boosts.
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Successfully operates in a chain powered by a standard 500mA/9VDC supply with no noise issues, highlighting its reliability.
Source

Use cases and applications

0 0

It performs well when used above the 12th fret on guitar, but tends to sound muddy below this range.
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The pedal excels with baritone guitars, 8-string guitars, and bass, providing a unique analog sound that pairs well with fuzz for doom metal tones.
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0 0

Ideal for saxophones, horns, or monosynths when aiming for a bass synthy effect, particularly effective with fuzz pedals.
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Owners find it effective for styles ranging from psych rock and blues to surf music and dreamy soundscapes.
Source

Comparisons

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The Boss OC-2/OC-3 is recommended over the EHX for those seeking higher quality octave effects, especially for bass.
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0 0

Its analog sound is reminiscent of the Mu-Tron Octave Divider, offering a less clean octave effect that can be charming or frustrating based on use case.
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User experience

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Tracking issues are common, though some find it better than other analog options, yet it struggles to pair well with fuzz for "octave fuzz" sounds.
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0 0

The pedal is described as "growling, yet funky," reflecting its strong, dynamic presence in a musical setup.
Source

Mods and upgrades

0 0

EHX's deluxe versions with additional controls like fuzz and -2 octaves are noted as desirable, indicating potential modification interest.
Source

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4.0 out of 5

Based on 4 Reviews and 55 Ratings

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jimmarchi1

41029

over 8 years ago

a classic that's maybe not as great as the mutron octave divider

to me the mutron octave circuit is the gold standard of 70s analog octave effect... that said the EHX multiplexer tracks poorly and has a relally clangy unantrul timber that's great as more of a splatty and ring moddy special effect sometimes. I'd still like to have a mutron but they're pricey thanks to neil young. I ave an old one of these and like many of my ehx pedals I don't like using them much because of the boxes and switches. this is another tonesucker too... but when recording its got a certain sumthin' sumthin'. for something analog but more hifi ona budget try an arion octave from the 80s . The plastic case is no flimsier than the old EHX sheet metal boxes and the arion sounds really good, tracks great... but as a psycho-grade special effect the multiplexer is super fun. Velcroey bass and claging high harmonics galore are in there when you get the high filter and blend setup right with the sub engaged. Too polite? try playing some doublestops instead of single note runs. The pog is comparatively polite. More useful? probably. But not to me.

Roles:

Guitarist Bassist Keyboardist

Genres:

Electronic Orchestra Alternative rock

drrrty_harris

268

about 5 years ago

A really fun piece of kit

This is a really fun pedal to use. I use it sometimes to play bass on my guitar. It is an analog pedal though, so expect some odd sound artifacts from time to time but that's what makes it fun to play. Listen to Neil Young's 'Hey Hey, My My (Into the Black)'... This is the pedal he uses to get that 'grungy broken speaker sound'.

Roles:

Guitarist Ukulele Player

Genres:

Alternative rock Indie rock Punk rock