Rack Extensions

Rack Extensions are available exclusively through the Reason Studios, and please be informed that VST/AU/AAX and Rack Extensions are separate purchases due to discrete development and store policy.

Compatible with Reason 10.1 or later.

Efektor Pitch Bundle RE Icon 300px


Pitch Manipulator Trio

The pitch manipulator trio. Now available as a bundle. The new Efektor
Meloditron, Harmonitron, and Whammo pedals at a reduced price.

Unleash a world of boundless possibilities with the Efektor Pitch Bundle.
This powerful collection of harmonizers and pitch shifters empowers you to
shape your guitar sound in ways you never thought possible. From bending
and shifting notes to creating mesmerizing harmonies, this bundle opens
doors to new musical dimensions. Elevate your sonic creativity and explore
a universe of harmonization with the Efektor Pitch Bundle.

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Smart Harmony Engine

Imagine having two virtuosos harmoniously jamming alongside you, consistently in perfect sync. Kuassa Efektor Meloditron follows your artistic preferences, delivering flawless harmonized notes in an extensive array of modes and scales. With Efektor Meloditron, experience the industry’s best note tracking accuracy.

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$39 (+VAT)

3 Preamp Pedals

A bundle of Efektor Gainia HB, TD and XT at a reduced price – the next generation of digital preamp pedals. Unlock the legendary tones of three iconic classics with Kuassa’s renowned 3rd generation tube modeling

Whether you’re seeking the tonal enhancement capabilities of the HB, the vintage tube-like tones of the TD, or the high-gain aggression of the XT, the Efektor Gainia series delivers an exceptional playing experience. These digital recreations offer convenience, affordability, and the ability to explore iconic tones that were once limited to rare and expensive hardware.

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$19 (+VAT)

Thick and Crunchy Tube Driven Preamp

Guitar pedal effect plugin developed after a renowned tube driver pedal from the 1980s. This plugin is able to recreate the warm and dynamic sound of the original unit, using advanced algorithms to model the behavior of a vacuum tube to capture the subtleties and nuances of the tube-driven overdrive sound

Upon loading the plugin, you will be presented with an intuitive interface that mimics the physical controls of the original pedal. The Drive knob allows for adjustment of the amount of gain and distortion, while the Low and High knobs adjust the overall EQ of the signal. The Bias control can be used to adjust the bias voltage of the virtual tube, affecting the overall tonal character.

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$19 (+VAT)

Dual Hot Preamp Box

Adds layers of depth and character to your sound that make it truly sing.

Guitar effects plugin that is crafted with the utmost care and attention to detail based on a renowned preamp box. This is a plugin that will deliver rich and vintage overdrive tones. You’ll be greeted with a warm and dynamic sound that’s packed with sustain. Instead of simply amplifying your guitar’s signal, Efektor Gainia-HB adds layers of depth and character to your sound that make it truly sing.

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$19 (+VAT)

Mid to High Gain Preamp

Versatile mid to high gain preamp with boost and edge control. Push the distortion even further, adding extra intensity to the tone with Boost and Edge.

One of the things that sets the Efektor Gainia-XT apart is its range of controls. With knobs for gainboost, and edge controls, guitarists have the ability to fine-tune their sound to their exact specifications. And with the built-in boost function, they can push their distortion even further, adding an extra level of intensity to their playing. Whether you’re playing metal, rock, or any other genre that requires high-gain tones, Kuassa Efektor Gainia-XT has proven to be a reliable and versatile tool.

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Tube Driven Power Amp

Add bright to bite, glow to growl, and everything in between that works well for any genre you play. It’s Free and will perfectly complement Efektor Gainia Series.

Designed as a perfect complement to the Efektor Gainia series, Pillar Power Amp enhances the already impressive capabilities of the preamps, creating a seamless and immersive guitar tone solution. Not only that, but Pillar stands on its own as a versatile tool for multiple creative purposes and tube-stacking.

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$39 (+VAT)

3 Bass Distortion FX Engine

The new Efektor Bass Cruncher Preamp, Bass Smasher Distortion, and Bass Driver Preamp pedals. This bundle offers a full spectrum of distorted bass tones to achieve tonal varieties, add bites, and solid aggression to bass tracks. At a reduced price.

While these pedals are developed specifically for bass guitar, they are versatile enough to use on any low-frequency instrument, from synths to percussion and even vocals. As with all the newer generation Kuassa
products, the second-generation Efektor series models a more specific effect type, feature sets and improved GUI framework.

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Amplifikation Rectifor
Fast and Loud, Tight and Heavy

$49 (+VAT)

Triple Rectification Amp.

Amplifikation Rectifor is inspired by the High Gain Mesa/Boogie* Guitar Amp It’s the fifth product on their range of Guitar Amp Simulator products which utilizes their 3rd generation of circuit modeling technology, proved to give a satisfying dynamic response from the amp tone generated. It’s also the first to implement Kuassa’s next-generation user interface. Streamlining the process of operating the plugin for users with a cleaner, sleeker interface.

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Amplifikation VVV
Three Major Version from an Iconic Amp

$49 (+VAT)

Signature of A Legend.

Inspired by a signature amp of a legendary guitarist, an inventor who has inspired the 5XXX signature guitar amplifier which delivers a very specific kind of guitar tone, dubbed as the “brown sound“. Thanks to third generation modeling technology, you can expect a heavy tone with a dynamic, responsive feel. Take a look at the difference, we dare you to compare!

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Efektor Whammo Pitch Shifter
Pitch Shifter/Bender

$39 (+VAT)

Ready, Shift, Go!

There aren’t many examples of gears that stand against the test of time, and there are even less that continue to be relevant in today’s generation. However, pitch-shift/pitch-bend pedal is one of them.
Kuassa captures the essence of sound and functionality of the pedal and rebuilds it into a convenient Rack Extension version to be used within your PC or Mac system. We are very proud of this one, and we hope this Efektor Whammo Pitch-Shifter will serve you well.

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$39 (+VAT)

Quad Harmonizer FX

The ultimate pitch shifting and harmonizing tool for sound designers and music producers. Unleash the power of pitch manipulation to add depth and dimension to your soundscapes. With the ability to add extra low-fatness and detune to thicken your riffs, rise different pitch notes to enrich your vocals, or use the swell (slow attack) feature to create an organ or synth-like tone with your guitar.

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$19 (+VAT)

Bass Tube Preamp FX Engine

We put our proprietary third generation tube engine into a single effect unit created to add some spicy tone to bass instruments. Efektor Cruncher brings colors and flavors to enrich your bass and make it scream. Add bright to bite, glow to growl, and everything in between that works well for any genre you play.

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$19 (+VAT)

Bass Preamp/DI FX Engine

Inspired by a renowned bass DI unit, Efektor Driver provides an extensive range of tonal shaping capabilities to satisfy your interest in low and deep sounds. Bring out vintage tube tone, glow up your slap, or just add an extra dirt without sacrificing the bottom end.

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Efektor image RE 300x300 CS6-24

 $19 (+VAT)

Bass Distortion FX Engine

Developed specifically for bass guitar or any other low frequency instrument, Efektor Smasher delivers massive and heavy distortion which covers a broad range of dirty tone. Dial a chunky overdrive, thick and meaty distortion, or muff-like sustained wooly sound from a single effect unit.

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Amplifikation Lancaster
Charm of British Amp

$49 (+VAT)


The fourth product on our range of Guitar Amp Simulator products utilizing our 3rd generation of our modeling technology. Amplifikation Lancaster is inspired by Vox* combo amps and thanks to the 3rd gen Tube Simulation engine guarantees satisfying, dynamic natural sounding, realistic amp recording experience for guitarists.

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Amplifikation Clarent
Thunderous Rockin’ Amp

$49 (+VAT)


The third product from Kuassa’s 3rd gen Tube Simulation technology following the much-hyped Amplifikation Caliburn and Matchlock. Amplifikation Clarent is inspired by Orange* amps and thanks to the 3rd gen Tube Simulation engine guarantees a more dynamic natural-sounding, realistic amp recording experience for guitarists

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Amplifikation Matchlock
American Guitar Amp Rack Extension

$49 (+VAT)

Our Best Amp Simulator (yet) for Rack Extension, American Style!

The second product from Kuassa’s 3rd gen Tube Simulation technology following the much-hyped Amplifikation Caliburn. Amplifikation Matchlock is inspired by Fender™* combo amp VST and thanks to the 3rd gen Tube Simulation engine guarantees a more dynamic natural-sounding, realistic amp recording experience for guitarists.

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Amplifikation Caliburn
British Guitar Amp Rack Extension

$49 (+VAT)

Our Most Realistic Amp Simulator (yet) for Rack Extension platform.

Our brand new amp simulator Rack Extension called Amplifikation Caliburn which we are confident to say that this is our best amp yet. This time, it’s inspired by Britain’s Marshall™* Amps crafted using our most current 3rd generation modeling technology, resulting in a satisfying responsive feel, more dynamic guitar playing experience you’ll love.

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Cerberus Bass Amp
Bass Guitar Amplifier Rack Extension

$49 (+VAT)

Lo{w} and behold.

A 3-channel bass amplifier Rack Extension from the maker of Amplifikation Vermilion and Creme. Cerberus Bass Amp will deliver thundering lows straight from your computer, carefully tuned, and carrying enough power to rumble your studio.

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Amplifikation Vermilion
Combo Guitar Amp Rack Extension

$39 (+VAT)

Guitar players now have a reason to play Reason. Whatever your playing style is, from country clean to somewhat heavy metal, this amplifier will provide any sound you need. Don’t play the guitar? Don’t hesitate to use this device on any other instrument as well! Plugin, baby!

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Amplifikation Creme
Metal Guitar Amp Rack Extension

$39 (+VAT)

Hard rockers, metalheads, raise your horns! Here is another reason to go Reason. Equip your ax and deliver sonic mayhem with this modern high-gain guitar amp, or insert this amp into other device chains to add a steely edge.


Amplifikation Bundle
Guitar & Bass Amp Rack Extension Bundle

$149 (+VAT)

Who said Reason is only for electronic music stuff? Don’t wait any longer, take that axe and shred immediately with this astounding bundle of Kuassa Amplifikation series. Included in this bundle are; Amplifikation Caliburn and Amplifikation Creme for your high-gain obliteration, Amplifikation Matchlock and Amplifikation Vermilion for crunchy and twangy stuff, and our Cerberus Bass Amp for you who takes charge of the bottom line.

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Efektor RV3604 Reverb
Reverb FX Engine Rack Extension

$25 (+VAT)

It gives ambiance, creates space, and produces a sense of three-dimensional to the original sound.
Reverb provides five types of Reverb to play with; small room, large hall, metallic plate, bouncy spring, and the haunting yet atmospheric shimmer.

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Efektor DL3606 Delay
Delay FX Engine Rack Extension

$25 (+VAT)

Five most desirable types of delay pedal effect.

Complete with modulation parameter to add life and movement to the repeats or echoes.

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Efektor GQ3607 Graphic Equalizer
Free Graphic Equalizer Rack Extension


Free 7-band graphic equalizer pedal effect Rack Extension.

Apply 3-types of quick EQ adjustments for Reason Studio to enhance the tone while still offer intuitive and straightforward controls.

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Efektor WF3607 Wah Filter
Wah / Filter Effects Rack Extension

$25 (+VAT)


Designed to mimic the “wa wa” sound from a Wah pedal. WF3607 features 6 modes of filtering effect taken from the familiar crybaby sound to synth-like filters.


Efektor CP3603 Compressor
Dynamic Processor Engine Rack Extension

$25 (+VAT)

For firm, better, well-balanced guitar tracks.

Completing your virtual pedalboard with our Efektor series, now introducing: KUASSA CP3603 Compressor unit. This will suppress the loudest part of the incoming audio signal, based on the specified threshold. Following the ‘compression, it will increase the softer signal, narrowing the dynamic range thus delivers a more consistent overall level.


Efektor TR3604 Tremolo
Tremolo Effects Rack Extension

 $25 (+VAT)

Classic Tremolo Modulation with More Waveforms

Probably one of the oldest effects applied to musical devices. This volume modulating effect is known to be equipped on guitar amps such as Twin Reverb or AC30. Classic volume modulation with greater control over tremolo speed and wave shape


Efektor PH3605 Phaser
Phaser Effects Rack Extension

$25 (+VAT)

The Phase Shifter from the Outer Space

Full name, phase shifter. Typically more subtle than a flanger, but sounds like warbles coming from outer space. Often used on Rhodes electric piano, and of course by guitarists such as Brian May (Queen) and Eddie Van Halen (Van Halen)


Efektor FL3606 Flanger
Flanger Effects Rack Extension

$25 (+VAT)

Howling, Swirly, and Flanging Tone

Originated from manipulating tape recorders by slowing down one of its flange (hence the ‘flanger’ name), this effect creates a swooshing sound dubbed as the ‘jet engine’ effect


Efektor CH3604 Chorus
Chorus Effects Rack Extension

$25 (+VAT)

From Classic to Vast Spectrum Chorusing Effect

Recognizable from its doubling effect found on many classic effect pedals, this type of effect is also known as a standard built-in effect from gears such as the Jazz Chorus amp and also the Juno synthesizer.

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Efektor Modulation Bundle
All Modulations in One

$75 (+VAT)

Following the footsteps of our Efektor Distortion Bundle, Efektor Modulation Bundle faithfully recreated after 20 models of fabled modulation effects from the 1950s to the last decade we’ve researched and picked only the best of all. 

Modulation type effects are widely used by organ/synth players, guitarists, and studio engineers to add width, depth, and movement to the original sound, resulting from a lush variation or even an eclectic experimental feel to a sound.


Efektor OD3603 Overdrive
Overdrive Effects Engine Rack Extension

$25 (+VAT)

Designed to drive amplifiers to the edge, OD3603 lets you dial five kinds of crunchy tone, singing sustain, and gnarly edge for your instruments. Back in the early days of electric guitars and amplification, guitar players didn’t care if their guitar sound was altered to ‘breaking’ by the very limit of their amps. They pushed the gain on their amps for just one thing: LOUD. It resulted in crunchy saturated sound, added sustain, raw, but responds very well to the dynamics of the playing. OD3603 Overdrive is built straight for rock n roll in a box, you may choose from five models of overdrive


Efektor FZ3603 Fuzz
Fuzz Effects Rack Extension

$25 (+VAT)

Probably the most primitive type of distortion device. Instantly recognizable from the wooly, gritty, and compressed ‘artificial’ sound. There are five types of buzzy tone benders on the FZ3603. Recognizable from its distinct sound, heavily clipped and compressed to the point where the waveform is squared, adding harsh and complex harmonics and inharmonic, almost synth-like.


Efektor DS3603 Distortion
Distortion Effects Rack Extension

$25 (+VAT)

There are always demands for more ‘gain’; the search for the perfect distortion sound that never ends. DS3603 brings five types of massive amount of gain for demolition. It clips the input signal by increasing the signal to maximum overload. Adding musical harmonics and overtones while still maintains the characteristics of the original sound, or not. You choose.

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Efektor Distortion Bundle
DS3603 + FZ3603 + OD3603

$59 (+VAT)

Researched from more than thirty kind of most sought-after dirt effect pedals. We picked the exceptional ones and narrow them down into three devices which covered in this bundle: DS3603 Distortion, FZ3603 Fuzz, and OD3603 Overdrive.


Efektor Silencer
Noise Gate Rack Extension


Ssshh…. Be silence. Nobody likes unwanted noises from their sound. Especially the dreaded distorted noise. Taken from the Amplifikation series and improved dual-mono mode, now the Noise Gate unit is available for the masses.


Kratos 2 Maximizer
Loud and Clear

$69 (+VAT)

Kuassa’s ooh-so-handy limiter/loudness maximizer is now available as Rack Extension. Make your Mix LOUD transparently without sacrificing punch and sound quality. Straightly whooping to the new version 2 for Propellerhead Reason Users; now Kratos 2 Maximizer features the new Adaptive Mode, dithering section, up to 4x oversampling.


EVE-MP5 Program Equalizer
50s EQ Rack Extension with Saturation

$59 (+VAT)

Kuassa EVE-MP5 is a reproduction of two of the most sought-after classic hardware equalizers, the Pultec* MEQ-5 Midrange Equalizer and the EQP-1A Program Equalizer. We drew inspiration from them and combined both EQs into a compact 3U device with a color coded, straightforward interface intended for fast workflows and maximum usability.

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EVE-AT1 4-Band Equalizer
Classic British EQ Rack Extension

$39 (+VAT)

4-band parametric equalizer with an additional high-pass and low-pass filter. Inspired by the EQ section of a renowned British Classic –the Neve* 1081– this equalizer delivers a clear, smooth, and musical sound to shape your tracks.

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EVE-AT4 3-Band Equalizer
Classic British EQ Rack Extension

$39 (+VAT)

3-band equalizer with an additional high-pass and low-pass filter. Designed as a tribute to the EQ section of a well-known British Classic –the Neve* 1084 –this equalizer delivers character in spades to add sheen, remove mud, and shape tones.


EVE-AT Bundle
Modeled EQ Rack Extension Bundle

$75 (+VAT)

Need a Shape? Whether your song, mix, individual tracks or instruments need tone polishing, this bundle contains the tools to get them into shape. The EVE-AT bundle contains equalizers modeled after three widely used shapers of popular music of the last century, the Neve* 1081, Neve* 1084, and Pultec MEQ+EQP. The Extensive Vintage Equalizer Bundle is a 3-pack equalization series by Kuassa. The EVE-AT1 was designed for general usage, EVE-AT4 for stronger ‘character’ equalization, and the EVE-MP5 for adding a saturated edge.


Studio Bundle
Kratos 2 + EVE-MP5 + EVE-AT1 + EVE-AT4


$139 (+VAT)



The perfect combination for shaping and preparing your tracks into a commercial-ready, quality tracks. Inside is three functional EQs modeled after legendary Equalizers to remove mud, rumbles, honk or any impurities, then sweeten it to give a clear tracks which sits perfectly through the mix. For a final touch, Kratos 2 Maximizer is a perfect tool to finalize the master, giving the desired commercial, transparent loudness to compete with all other music played on the radio, records or streaming platforms.

*Disclaimer: All other product names and trademarks are the property of their respective owners, which are in no way associated or affiliated with Kuassa