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Synth (Analogue / Subtractive) Plugin by Futucraft
Kairatune by Futucraft is a Virtual Instrument Audio Plugin for macOS and Windows. It functions as a VST Plugin, an Audio Units Plugin and a VST 3 Plugin.
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Kairatune is a monophonic virtual instrument designed to produce crisp and tight electric sounds. Kairatune is engineered for the demanding producer who needs to push the sound to extremes without compromising audio quality.

Kairatune offers fast and intuitive sound design workflow. The user interface is designed for a musician rather than an engineer and is based on the concept of pitch and tempo in contrast to frequency and time. Kairatune lets you travel in the world of beats, notes and intervals instead of the logarithmic mathematics of frequencies and the rarely useful absolute time.

Kairatune is not your all-in-one synthesizer. It's designed and engineered to be as powerful and versatile as possible in its target role as your source for tight bass, unique lead and shiny SFX sounds. At the same time it makes all the effort to be simple enough to use, enabling you to add your personal touch and flavor to the sound and seek for the perfect fit to your mixing preferences.

The generator section has just one multi-oscillator. The basic waveform generator is very simple adjustable mix of sawtooth and square wave. The multi-oscillator generates five waveforms whose relative pitch, phase and amplitude may be configured and modulated enabling a rich set of tones. The multi-oscillator uses quite unusual technique that generates a single fundamental signal independently of the (multiple) overtones, preventing the beating effect that arises where several oscillators are output in slightly detuned unison, yet preserving the full and fat sound on the overtone spectrum. The method enables building very rich and vivid sounds on a perfectly solid bottom and is especially useful in creating tight bass and low register lead sounds.

Key features:

  • Multi-oscillator sound generator, virtually a single oscillator with the sound of five.
  • Independent fundamental generator prevents beating at the bottom while enabling full and vivid treble.
  • Tempo synced envelopes and modulators for rhythmic action.
  • Advanced stereo image and spatial modulation.
  • HPF and BPF delay units, phaser, EQ.
  • All parameters accessible at once on a single panel.
  • MIDI learn function.

Latest User Reviews

Average user rating of 4.40 from 5 reviews

Reviewed By Trader One [all]
January 10th, 2022
Version reviewed: 1.2.8 on Windows

Simple synth for acid music. Sound is good and unusual. Fast to make new sounds. Its pretty inspiring, you can enjoy fun know from HW synths - just turn random knobs and see what it will do.

It really needs MSEG or at least 32 step ARP.

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Reviewed By Synthesis [all]
October 19th, 2018
Version reviewed: 1.2.5 on Windows

I legitimately don't know why this only has four stars. Thanks to options like trill and delay, this is pretty much the ultimate ambient plugin. You can make warm pads, epic leads, and amazing FX. Also, once you get the hang of it, you can even start using it to make dubstep wobbles and growls. I'm shocked it's free; this could easily go for $30+.

Another amazing part of this is the interface. This plugin not only sounds amazing, it looks amazing. Working with this plugin is so, so much fun, and if you produce any kind of electronic music, this plugin is a must-have.

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Reviewed By ZacoOne [all]
July 23rd, 2017
Version reviewed: 1.2.4 on Windows

Excellent free synth plugin! Grants you the ability to create awesome sounds. Would rate 10 if it were polyphonic, but its free. Can't complain to much...

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Reviewed By orange [all]
February 11th, 2012
Version reviewed: 7 on Windows

well for a free plug you cant go wrong with this one..


this thing sounds nice and organic, it fits electronic music in the trance/psytrance/techno very very nice.

the oscillators are sharp and clean with a fat and playful character. although there is a small aliasing in the very high registers but nothing that will hold you back.

it fits easy in the mix and this is very important.

envelopes could be a tad better for fast attack short release trance basslines, dont get me wrong they are tight but could be a bit tighter/faster specially when used in 16th sequences with fast attack short decay/release.


well it has some weird modulation slots specially in the lfo domain.. its not the usual stuff but very creative.

could do with some more straightforward approach but it works nonetheless.


i could do with more filter options but the ones provided work very good, sound nice and there isnt any noticeable stepping for that smooth filtering action.

resonance could be better for some self oscillating pads and atmos.


its nice and easy on the eyes but the unconventional approach could scare some since it doesn't have the usual analog style.

personally i like it since it makes me to get out of my comfort zone and produce some excellent sounds.


i wish this thing was polyphonic.. i can imagine that those nice and fat oscillators would produce some great and super fat polyphonic sounds.

its fairly light on the CPU overall but i have seen some odd performance in studio one v2 (but this maybe is a host issue cos it works very smooth in flstudio 10)

all in all this is excellent i dont give it a 10 just cos i feel this thing needs a polyphonic version.. and i would pay for it.

its a lead workhorse for me.. for the standart lead sounds but mainly for the organic psychedelic sounds and fx.

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Reviewed By Fred e [all]
September 26th, 2011
Version reviewed: 1.0 on Windows

Love at first bleep! This one is going to be another classic. Great one-screen UI with convenient sized knobs and popup tool tips that quickly explain how stuff works.

Mainly it makes wobbly leads, FX and warm basses. Sound quality is excellent, warm but yet distinct and sharp, fits easily into a mix. The modulation wiring comes with some unusual LFO trickery, "trill/vibra" (?) that gives an instant glitchy sound character. First time I have seen an LFO modulated drive.

Feels stable, little CPU payoff, documentation is integrated in the UI, presets are perfect for electro/trance/techno and related genres. A must have!
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Comments & Discussion for Futucraft Kairatune

Discussion: Active
11 February 2012 at 8:58pm

I must add that the CPU usage can actually be pretty brutal (depending on the machine of course). We just did Kairatune in the KVR One Synth Challenge and many of us were having problems. I could get about four instances on my old P4 before it was time to render to save CPU. Folks with beefy i7 machines were having fewer problems. It was an enjoyable synth to work with in the end, oh and did anyone mention... its Freee!

3 March 2012 at 2:12am

Wow... this sounds amazing from the few minutes that I tested. I can see myself creating some absolutely brutal basses with it.

22 February 2014 at 1:40pm

Amazing quality for a free synth. Very Nice.

29 November 2014 at 2:10pm

I really love this synth. I had it in my inventory since it's first version, but only recently really discovered it (blame goes to a buggy synth with a similar name), Now I'm using it all the time. It's a great synth to play around with and not lose any creative flow you're in. It can make unique and great sounds with only a handful of parameters. Quality wise it looks, sounds and feels like it's a lite version of a big commercial synth. It's amazing for leads.

28 July 2017 at 11:48am

hey, .

you want polyphonic? look at this (i know it's in FL and it's a little convoluted, it's a work around i guess). i am impressed with this synth. a lot and recommend it...

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