KMA Machines Launches the Mandrake Octo-Shrieker Analog Upper-Octave Fuzz Pedal

KMA Machines has launched Mandrake Octo-Shrieker, promising player-friendly octave-up fuzz magic from a compact, tweakable stompbox. It brings an even more robust and present upper octave to the sonic table.

KMA Machines has gone searching actively in the circuitry of its Moai Maea for inspiration and has reworked and improved its octave-up circuit for the Mandrake Octo-Shrieker, a guitar effects pedal that is like classic octave-ups of yesteryears, only more tweakable, more user-friendly – and also more pedalboard-friendly.

The Mandrake offers “subtle tone enhancement to full-on dual octave grind”, and presents players with ample control over the octave-up sound. KMA Machines says this new circuit is blessed with better tracking, making for a sound that’s more robust no matter how you choose to use it.

Flexibility was the goal, which is not necessarily a gimme in the world of octave-up fuzz effects. They can be temperamental, running away with themselves and letting the upper-frequency harmonics take over.

This applies a quote/unquote “enhanced rectification circuit topology” to a discrete transistor-based fuzz, and pairs this with an active pre-gain second-order filter to keep your electric guitar’s signal pristine for the octaver.

The second-order filter is controlled by a Filter knob, and the further you turn it clockwise the smoother it gets, with quasi-synth fuzz sounds at its extreme.

Set it below noon, or leave it fully counterclockwise – and you’ll get “unhinged, cutting and shrieking mayhem”, hence the name Mandrake, which as legend has it would shriek as it was plucked from the soil, destined for a potion or poison.

Filter is your friend when switching over from single-coil guitars to humbuckers. Timbre is another key control for shaping the octave-up voice to complement your signal. Fully counterclockwise, KMA says it might sound a bit “crunchy and percussive” but as you turn it up the sound blooms.

Once more, the extremes of a control yield an extreme sound to work with – “a crushingly saturated doom-hammer, instantly ready to wreak havoc with each power chord you throw at it!” as KMA puts it.

Again, bringing things back to practicality and versatility, there is an all-important mini-dial for Mix to adjust the balance between the processed signal and the sound from your guitar, and there’s another mini-dial to control the level of the octave-up effect.

The Mandrake Octo-Shrieker is an octave-up pedal for fuzzy retro sounds a la QOTSA, Jack White et al, and it can get wild, but it does subtle, as well, and crucially it is easy to dial in your tone.

Main Features:

  • Analog upper octave pedal – from subtle tone enhancement to full-on dual octave grind
  • Ultra-fast tracking, with variable TIMBRE and FILTER controls
  • Easy-to-use interface, with high levels of flexibility
  • Discrete transistor-based fuzz, with enhanced rectification circuit topology – for a more robust and present upper-octave
  • Active, pre-gain 2nd-order filter section, designed to perfectly prepare any instrument’s signal for octaval tones
  • Independent Mix controls for precise balancing of both the effected and dry signals
  • Compact enclosure with top-mounted jacks – will fit into any setup
  • True Bypass silent relay-based soft switching

The Mandrake takes 9V from a pedalboard power supply, drawing 30mA, it is true bypass. It is available now, priced £149/ $169.99 (excl. VAT). See KMA Machines website for details.


Das Keyboard 6 Professional - Begin to enjoy your modern workday.

Dr.Fone V13 One-Stop Complete Mobile Solution

Wondershare RecoveritData Recovery

Great deals on Live Sound and Lighting gear. Microphones, speakers, mixers and more. Fast, free shipping.

Great deals on Recording Gear. Interfaces, headphones, monitors and more. Fast, free shipping.

Great deals on DJ and Production Gear. Fast, free shipping.

Sam Ash Music Flash Deals: Special Discounts on Musical Instruments & Music Studio Gear

Shop Used Musical Instruments, Used Guitars, Used Drums, Used Pianos, Used Pro Audio Gear, Used DJ Equipment

Samson Recording Headphones: Save Up to 70%

TONEX ODS Legends Signature Collection

Up to 56% off Total Studio 4 MAX complete music production software bundle

Black Friday Deal: T-RackS 5 MAX v2 $/€79.99 or SampleTank 4 MAX v2 $/€69.99

Weekly Krazy Deal: TASCAM Tape Collection $/€39.99 or The Farm Studio Reverb $/€29.99

Black Friday Deal: MODO BASS 2 & MODO DRUM 1.5 $/€79.99 each or $/€129.99 for both

Black Friday Deal: TONEX MAX & AmpliTube 5 MAX v2 - $/€79.99 each or $/€129.99 for both

Weekly Krazy Deal: FAME Studio Reverb and Hammond B-3X $/€39.99 each

Pianoverse NY Grand S274

Pianoverse Black Diamond B280

Pianoverse Royal Upright Y5

Pianoverse Concert Grand YF3

UNO Synth true analog synthesizer - ultra-portable and ultra-affordable

iRig HD X

iRig USB mobile audio interface for guitar & bass

Pianoverse piano virtual instrument

Total Studio 4 MAX music production software bundle from $/€199.99

AmpliTube 5 MAX v2 guitar software $/€99.99

T-RackS MAX v2 mixing & mastering software $/€99.99

UNO Synth Pro X Paraphonic dual filter analog synthesizer

TONEX Collections

AmpliTube Morley Collection

AXE I/O ONE 1-in/3-out USB audio interface


Exclusive Education Savings for Wondershare

Leave a comment

Name: (Required)

eMail: (Required)