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Foxrox Electronics

FOXROX Octron 4

OCTRON4 is an expanded version of the Foxrox Octron3 pedal. It has the same features with the addition of 3 foot switches for activating signals. The Octave DOWN section includes the ability to dial in sub-octave sounds.


SWITCHING: TRUE BYPASS is handled by the foot switch on the top level. Blue LED is lit up when activated.

SIGNAL ACTIVATION SWITCHES: The three lower foot switches control relays that turn the signals on and off and they correspond with the level controls.

LEFT: Octave UP. Yellow LED shows status.
CENTER: Direct. Red LED shows status.
RIGHT: Octave DOWN and SUB, combined. Green LED shows status.

SUB: Creates a note more than one octave below the note you play.
DIVIDE BY 4: Two octaves below the note you play.
DIVIDE BY 3: One octave, plus a fourth below the note you play. Play E, and you get a very low A.


DIRECT LEVEL: Controls the level of the direct signal while the pedal is activated.
OCTAVE UP LEVEL: Controls the level of the Octave UP signal.
BRIGHT/PURE SWITCH: Selects between a bright sound, rich in harmonics, and a darker sound with a more pure upper octave.
OCTAVE DOWN LEVEL: Controls the level of the Octave DOWN.
SUB LEVEL: Controls level of SUB.
SUB DIVIDE 3 / 4: Select SUB for one and a half octaves down, or two octaves down.
MIDS/LO SWITCH: Selects between a mid-boost and a super-fat low end. Setting applies to both Octave DOWN and SUB signals.
INPUT JACK: 1/4" stereo jack. Disconnect Input to shut off battery.
OUTPUT JACK: 1/4" stereo jack. A stereo jack is used to maintain equal tension.

Tips for Octave Down Tracking
Like other Analog Octave dividers, Octron4's lower octave will get confused by chords, open strings, harmonics, weak pickups and sloppy playing. Clean, articulate playing is rewarded with near-perfect tracking. Here are some general tips for getting the best tracking results not only with Octron4, but with any octave divider, and even many guitar synthesizers that work on the same principles:

  • Use the NECK pickup - a guitar's neck pickup has the roundest and purest tone. As you move away from the neck, with middle, bridge, or any combination of pickups, you add more harmonics and less of the fundamental frequency. Lower octave tracking will become less accurate resulting in skipping and dropping out. Also, make sure your guitar is set up right. Dead spots and buzzing frets will cause poor tracking.
  • Let only one note sound - The octave down circuit will warble, skip and drop out if you play multiple notes at once or let open strings sound. Palm muting will help you control your dynamics and will produce the best tracking. The more articulate your single note playing is, the better the tracking will be. You can even use the tracking as a way to improve your playing.
  • Letting notes decay- As a note decays, there comes a point where the Octave down circuit can no longer determine the note you're playing. At this point it will sputter a little and drop out. The way to prevent this is to know at what point this happens, and modify your playing to prevent it. Learn just how long you can let a note hang and cut it off before the Octave down circuit gets confused. Note - with single-coil pickups the natural hum can get pretty loud. When especially bad, this can cause Octron4's lower octave to skip.
  • Play the chromatic scale on every string, up and down the neck. It seems that every guitar has one or two notes that just won't track well.

Customer Reviews

Based on 1 review
Foxrox Octron 4 - Fantastic Octave Fuzz!

I came across the Foxrox Octron many years ago as I loved the sound of octave fuzzes like the Octavia, Blue Box, etc. but wanted something that could do more... and maybe several of those sounds in one.

After getting the Octron I fell in love with it - it does great octave fuzz sounds from screaming octave up to thumping lows of the octave down. Years later I decided to get the Octron 2 as I loved the idea of being able to switch the different modes on/off - I had been changing them manually which could be a pain. I loved the Octron 2 even more and it's my go-to octave fuzz. Many years later I saw the Octron 4 was being developed so I decided to keep an eye on it. How could they improve in the design of the Octron 2?

When I saw the first demo clips for it shortly after being released I knew I had to have one - and I bought it brand new as soon as I could. And I am very happy that I did! Although very similar to the Octron 2, it is slightly more compact, has external controls for the bright/pure and mids/low settings, and the addition of a sub control which can either be two octaves or one octave plus a fourth below the note your playing. Although I love the Octron 2, the Octron 4 has expanded things a little further and makes for a very flexible octave fuzz pedal. The addition of the sub control is loads of fun, but you can get all sorts of great octave textures in this pedal.

I now keep the Octron 4 on my main pedalboard, and the Octron 2 on my home pedalboard - I can't be without one! I love how it makes solos really pop out in a crazy way, and you can get some great heavy rhythm sounds as well with careful playing (note that analogue octave pedals do not track like polyphonic octave pedals - you're best off sticking to your neck pickup, with the tone rolled off a bit or all the way, and playing mainly from the 12th fret upwards. With some careful playing to make sure it tracks well you can play a bit lower down the fretboard).
Between my Octrons and an Octavia I have all my octave fuzz sounds covered (I sold all the rest!!).