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Sound Module Plugin by Sonic Cat
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Purity by Sonic Cat is a Virtual Instrument Audio Plugin for macOS and Windows. It functions as a VST Plugin and an Audio Units Plugin.
- Windows XP / Vista / 7 / 8 / 10 / 11
- Intel or AMD 32-bit / 64-bit Processor´╗┐
- 100MB free disk space
- VST (2.4), Stand-alone (ASIO, WDM/KS, DirectSound)
- macOS 10.9 or higher
- Apple or Intel 64-bit Processor´╗┐ (Universal Binary 2)
- 100MB free disk space
- VST (2.4), AudioUnit 2 (AU2)
Copy Protection
Serial Number
My KVR - Groups, Versions, & More
158 KVR members have added Purity to 15 My KVR groups 189 times.
Not In Your MY KVR Groups
(or group limitation prevents versioning)
+15 in private groups

KVR Rank

Overall: 26   21   26

30-Day: 26; 7-Day: 28; Yesterday: 30

Purity is a next generation of digital musical instrument workstation and PCM Sound Module / ROMpler software.

Very Low CPU Load & RAM Usage!

Purity makes you concentrate on your music without being annoyed about anything not related to music. And Purity keeps the fame of the best software instrument with the lowest and most efficient CPU load and RAM usage. Purity will be the one of your best musical tools which can effectively express the musical idea and feeling that you have.

Feature Summary:

16-part multi-instrument with GM Support:

  • Channel link function allows patch layering.
  • Key/velocity range for splitting sound zone.
  • General MIDI normal/rhythm sound and control support.
  • 2 modes designed for each channel purpose - Melody/Drum.

Integrated Mixer:

  • Realtime audio level meters.
  • Priority mode for arranging patches.
  • 2 stereo output buses - main/sub.
  • 2 stereo send-return effect buses - chorus/reverb.
  • Channel copy/paste/swap function.
  • Up to 1024-voice global polyphony (64 per channel).

Layers Sound:

  • Blend up to 16 sound sources.
  • Make various, beautiful and powerful sounds.
  • Edit independently each source and can mix each volume and pan.

Integrated Pattern Sequencer:

  • Innovative structure for melody and drum.
  • Up to 64 steps with 5 lanes.
  • Rate time option with triplet.
  • Swing option to vary time rate.
  • Latch function for background pattern.

Preset Browser:

  • Fast patch change on-the-fly during live performance.
  • About 1600 factory sound presets (over 200 phrases and loops).
  • 9-color patch recognition.
  • Computer keyboard support.

24 types of Insert Effect:

  • Filters and EQ.
  • Compressors, overdrive and distortions.
  • Bit crusher, noise generator and stereo image.
  • Chorus, flanger, phaser and wah-wah.
  • Tremolo and auto-pan.
  • Delays and reverbs.

Easy-to-use Edit Panel:

  • Full-featured edit without paging.
  • Ergonomic placement and design.
  • Graphic envelope.

Integrated MIDI Keyboard:

  • Position-to-velocity-sensitive 88-key.
  • 2 wheels - Pitch Bend / Modulation.

Global Setup:

  • Options for system resources.
  • Options to identify user interface.
  • Switchable skins as Default/Black/Red mode.
  • Resizable user interface supports Retina/HiDPI.

Sound Demo

{See video at top of page}

Latest User Reviews

Average user rating of 3.25 from 4 reviews

Reviewed By VoidFlwr [all]
March 14th, 2023
Version reviewed: 1.4 on Windows

Sound is bad and cheap, but thats why I bought it. If U want some cheap ass nostagial "90s Rompler Style" sound, this is what u need.

Read Review

Reviewed By JockMcRonan [all]
September 1st, 2022
Version reviewed: 1.4 on Mac

Ugh, I thought I would take this for a spin as I am kind of lazy about getting up and moving to my rack to change presets on my Triton Rack...sorry, not sorry, but this is absolutely horrible. It is tinny, impy sounding and just reminds me of some of the cheap nasty romplers of the 90s, actually, a hell of a lot of it reminds me of crappy cheap portasounds and casiotones. Not sure I can recall a worse sounding rompler.

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Reviewed By HaganeSteel [all]
September 23rd, 2013
Version reviewed: 1.2.7 on Windows

Purity is Purty!

Note: This is going to be a revised and condensed version of the review I posted on the forums here: http://www.kvraudio.com/forum/viewtopic.php?t=391435&postdays=0&postorder=asc&start=107

Purity has recently been reduced to $49 USD, with prices adjusted for UK and EU residents. With this new, enticing price point, is Purity worth another look? In short: Absolutely.

Ease of Use

Purity has a GUI that is just shy of 750x600 pixels, with its editing pages taking up the lion's share of screen real estate. The result is a tall GUI with almost all of its editing parameters on a single page. To put this into perspective, the Korg M1's GUI is roughly 795x455 pixels - about 100 pixels shorter - with the majority of its editing features spread over 3 pages, squished to one side, and sandwiched between a keyboard and mode select switches, making for an even more cramped user interface than its pixel width and height suggest. This makes Purity comparatively easier to use, along with the fact that it doesn't use the Korg-specific jargon of the M1 such as "EG Time", "EG Int" and "Time Polarity" - which, as an old Roland guy, prompted me to look at the manual more than once - and rather sticks to calling things by simpler, more universal names.


It's hard to describe Purity's sound in less than 10,000 characters. It's clean, well-equalized, and production-ready. The acoustic instruments sound like a high quality 90's sound module, and can rival the likes of my Roland XP-30, while the synth leads, basses and pads are on par with any software VA available.

Purity features a Korg-like "Combi" mode, where up to 16 layers (or 32 total waveforms) can be linked together to create enormously detailed sounds. When combined with its extremely low CPU footprint, its arpeggiator, and even an onboard sequencer that gives you up to 4 measures to work with, it is a deceptively powerful synthesizer that is capable of producing some incredibly complex pads, phrases and rhythms (or even all three at once in a single Combi!)

The sample quality itself is stellar, with very little in the way of errors or artifacts. It's obvious why they called this synth "Purity" - because everything has been polished to a pristine and very usable shine. If, like me, you are frustrated by modern samples, sample tuning and offset issues, you will be happy to know that Purity has almost none of that (barring the GM sitar, which has a small problem with sample timing in the lower ranges).


For fifty dollars, you get a synth that feels like a genuine workstation, with sounds covering all musical genres, and an arpeggiator and sequencer that would make any virtual analog enthusiast weep. I've resisted the urge to make P-puns long enough; now I leave you with this: Purity is nearly Purrfect.

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Reviewed By Rock Hardbuns [all]
March 2nd, 2006
Version reviewed: 1.0.0 on Windows

So, I just got my hands on the brand spanking new Purity. Purity is in many ways an extension and improvement of Luxonix previous synth Ravity and they share many of the same pros and cons.

Like Ravity, purity atempts to emulate a hardware rompler very closely and does so with some success. If you like the way you work with a roland or korg rompler, you should definitely check Purity out.

Where Ravity only emulated the patch layer of a rompler, Purity takes it a step further by adding an over arching combi structure. This means you can have several patches loaded at the same time, arrange them in key and velocity zones and have them respond to different midi channels. Or, you can have several patches playing together as layers.

It's a very versatile setup, that should work whether you prefer multitimbral synths, or (the standard VST) one-synth-per-track style which would give you 16 patch layers.

The second largest difference with respect to Ravity, (and most romplers) is the built in sequencer. Again the word is versatile. It can serve as a regular sequencer for melodies and drum loops, but also as sort of pattern arpeggiator that plays the incoming notes.And given that each patch has its own sequencer you can use it to build casio style auto accompaniments.

It's not 100% obvious how the sequencer works at first, but that's to be expected given it's capabilities. Once you get it, it adds a whole new dimension of fun and inspiration.

Filters, effects, presets and the over all structure of the synth all look/sound good and self explanatory to me. But given that I have spent so much time with Ravity, I may not be the best judge. There are a lot of controls on screen, all clearly labeled, but I suppose a newcomer to the realm may find it bewildering at first.

Moving on.
At the heart of any rompler is the sample rom, which is Purity's weakness. About half of the sounds come directly from Ravity, and the other half are base samples for GM sounds. The quality varies. I like the Ravity sample set very much, so I have nothing against it returning here.

I am a little disappointed over the new additions though. I hoped that Luxonix would take the opportunity to add some kick ass samples of acoustic instruments, which was Ravity's big weakness.

The GM samples are OK, but nothing more. They work in a mix, but most of them won't do for anything more critical. Again, it's the acoustic type sounds that are not really up to today's standards.

The quality of the rom samples obviously carries over to the patches, so if you are looking for some top notch GM sets, look elsewhere. Atleast for the time being. The sample rom can be updated so it's possible that addtional sample sets will be released. Time will tell.

Having said all that, I still _love_ the sound of Purity. I have no need of emulating 'real' instruments. What I want is a tool for crafting new sounds that are inspiring and unique. The kind of sounds that can carry a whole track, and Purity delivers that.

So, if you are looking for a GM player or the best piano ever, Purity will disappoint you.

If you want a creative tool with both character and charisma, Purity will make you happy.
Read Review

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Comments & Discussion for Sonic Cat Purity

Discussion: Active
7 January 2012 at 12:23am


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