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Synth (Hybrid) Plugin by reFX
Nexus Nexus Nexus
Nexus by reFX is a Virtual Instrument Audio Plugin for macOS and Windows. It functions as a VST Plugin, an Audio Units Plugin, a VST 3 Plugin and an AAX Plugin.
Copy Protection
Online Activation (Challenge / Response)
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589 KVR members have added Nexus to 143 My KVR groups 756 times.
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+143 in private groups

KVR Rank

Overall: 53   40   53

30-Day: 50; 7-Day: 57; Yesterday: 82

Nexus is a next generation ROM synthesizer. Nexus delivers complex, ultra-fat, contemporary soundstorms. A powerful and flexible architecture is the foundation that supports the immediately useful and spontaneously engaging design of the instrument. Every aspect of Nexus was built to produce music of the highest quality, quickly, with the least amount of fuss.

New in Nexus 4

Advanced Librarian:

  • We have added some really cool features and quality-of-life improvements to the already amazing librarian in NEXUS4.
  • Featuring three columns for easy navigation.
  • Counters for folders, categories, and presets to give you an overview at a glance.
  • Color-coded tags, bookmarks, favorites, and a dedicated location for user presets.
  • History function: Easily go back a step (or two, or three, or more) - and forth again if and when needed.
  • Quickly find what you're looking for with instant sound preview, search-while-you-type, filter by category and tags, and so much more.

Arpeggiator Deluxe:

  • Access all sixteen layer arpeggiators, in addition to the main arpeggiator.
  • Never lose track of what's happening with the fully interactive, zoomed-out overview at the top.
  • When zoomed in, the new "follow" option always scrolls with the playback.
  • Extend the pattern length up to 256 steps and play the most complex patterns you can come up with.
  • Sequencer mode: Create the most complex patterns with multiple notes per step and set the velocity individually. Zoom in on the x-axis or the y-axis to make fine adjustments or zoom out to have an overview of the full pattern.
  • Editing has never been so comfortable. This is the best Arpeggiator you can find on the market.


  • Full visualization of the signal-flow for real-time feedback:
  • You see what you hear and you hear what you see.
  • Five insert effects, four equalizers, filter, reverb, delay, and impulse. Color-coded for navigating incredibly fast.
  • Now featuring an incredible glitch effect and the brand-new OTT compressor.
  • Effects can be rearranged by drag'n'drop and the entire FX chain can be saved and loaded.
  • All on one page. No clicking back and forth countless times to get to the desired result.


  • Clean and comprehensible visualization of the signal-flow per layer. Easily pinpoint what affects the sounds.
  • Enable or disable entire layers with one click or play around with individual effects and oscillators.
  • Easily adjust the level, panning, and tuning of the oscillators.
  • This enables you to split complex SQ sequences into their components and single out individual sounds (just the bass, for instance) to easily create your own melodies.


  • Vector-Based GUI:
    • Sharp and crisp. Always. Resize to what is convenient for you.
    • No matter the resolution of your screen, NEXUS4 always looks good.
  • Easy Macros, Easy Modulation:
    • Four quick-access macro controls and a total of 20 modulation slots.
    • Convenient and easy to use.
  • Improved Cloud-Sync Feature:
    • Automatically store your favorites, bookmarks, user presets, and settings in the cloud.
    • Getting back your content when installing NEXUS4 on a new computer has never been easier.
  • Fast, Easy on the Resources:
    • NEXUS has never been faster and better.
    • Preset loading times and CPU performance have been vastly improved.
  • Compatible with NEXUS2 and NEXUS3:
    • NEXUS4 is compatible with your existing NEXUS2 and NEXUS3 libraries. Load your old beats into your DAW and load the sounds you've had before.
    • Upgrading has never been smoother.
  • More Sounds:
    • NEXUS4 expands the factory content by more than 260 new, high-quality, hand-crafted presets.
    • Because one can never have too many sounds.
  • Online Activation:
    • Yes, we've heard you. No more dongles or other third-party tools required.
    • Activate NEXUS4 online - it'll only take a few seconds and you're good to go.
  • ReFX Cloud App:
    • Installing NEXUS4 and any expansions is easy.
    • Click the icon of the product you'd like to install. Done.


  • Electronic documentation (online).
  • 2,799 sound-presets divided into 22 categories.
  • 2,238 multi-samples (~18 GB uncompressed).
  • 211 impulse responses.
  • 119 arpeggiator-presets.
  • 95 effect-presets.
  • 52 trancegate-presets.

Latest User Reviews

Average user rating of 3.79 from 14 reviews

Reviewed By harvizzle [all]
March 12th, 2024
Version reviewed: 3 on Windows

Your choice is your own, but personally, I'm just too poor to own this VST that I already bought.

It has great some great sounds! However, Refx is now fully embracing the current greedy business practice, where user experience is purposefully made irritating or disappointing in order to coerce users towards new products and services.

For instance, a few years ago I sprung for Nexus 3. I learned after purchasing it that to install it, I would first need to download the "Refx Cloud" application. Fine- a separate tool to download preset packs for Nexus. After releasing a new version of Nexus, the cloud app doesn't say clearly which version the packs are for, so be careful, or you'll be wasting hours trying to refund packs for "outdated" Nexus. Also, upon my recent reinstall of Nexus 3, packs for future versions of Nexus were automatically installed, and I have to mark the presets as I use them to know which I cannot use. These also temporarily break the VST after trying them.

Essentially, they are punishing me for not upgrading to the newer versions of Nexus, which are hundred of dollars and apparently come out every year.

Read Review

Reviewed By Cvader42 [all]
December 6th, 2022
Version reviewed: NA on Windows

I have been Downloading this plugin aLLLL day and I have no idea why???? Its up to over 60GB Downloaded and i have spooky fast internet it shoudl of been done hours ago...i dont understand why the heck its so damn big for .....

Read Review

Reviewed By markryder [all]
November 25th, 2022
Version reviewed: 4 on Mac

DONT BUY it as it super over priced old and outdated sampler all sounds come from other real virtual synths that are much cheeper and better to buy.

They take your money and give the worst dismissive support thanks to Alan in support who has a god complex.

You can never sell or transfer the licence and if you try they will deactivate your purchases making any investment in them dead having paid them your money and use of the product is gone and you are left helpless to ever use what you bought from them.

I have a long history in supporting developers but this people stop my money and renamed on their side of purchase.

The irony is I never actually used it on any of my music. You don't need it there is so much better out there now days.
They just repackaged the old GUI to reap more money from you to buy samples taken from other synths
I don't even advise running the crack but the way I have been treated by the after purchasing and feeling that they have stolen my money I know I have to warn others to Avoid giving them yours REFX lie about what they sell and wont reply to your requests to deliver on promises made during purchasing.

AVOID REFX you will be disappointed and fleeced.

Trust me don't invest in them you'll get burnt and my history in dance music should be enough for you to know my advice is sound. spend your money with a real developer that will help in your creativity rather than see you as easy pickings for their income.

Read Review

Reviewed By Oddest Noise [all]
November 21st, 2022
Version reviewed: 4.5 on Windows

Recently I bought Nexus 4 with a few extensions. The sound quality is very good and there are many possibilities with this rompler. The NKS coupling works well too. I was happy with it, until I contacted support for a user question: "Is it possible to do a MIDI program change to get different sounds?" Because I really miss this feature.

Instead of a helpful explanation why reFX doesn't support program change, I literally got the answer: "You seem to think we work in a vacuum and have zero contact with our users." But that was not my thought at all. I asked this question, because I own many VST instruments, where the program change feature is very common.

In my personal experience reFX has unfriendly staff. For the purchase price, I should have expected more helpful answers to my question. Too bad I feel like treated like an insignificant number as a customer so I'm disappointed.

I wonder if more people have this experience...?
Because I really hope this was an exception, so I could add a few more stars to my rating.

Read Review

Reviewed By dkcalifornia [all]
November 12th, 2020
Version reviewed: 3 on Windows

I wanted to warn anyone who has a setup where they attach their laptop to a dock that includes a monitor in addition to using their DAW detached.

Since Nexus 3 does away with the USB dongle as its method of copy protection, it now tries to look at your computer hardware devices and come up with a "computer ID" as some sort of unique identifier. This causes a problem if your driver configuration changes when you are docked vs. not docked. Nexus 3 detects this as a violation of the registration and makes you login to reauthenticate every time you dock/undock.

I provided ReFx with very detailed steps on how to recreate this issue, but they haven't responded. Another warning, if they cannot "help" you in a single free remote session, they tell you they will charge you for subsequent sessions.

Although I can understand the hate for USB dongles, imho they have broken their product and don't care to address it even with detailed description. I am uninstalling and will not purchase from ReFx again.

Read Review

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Comments & Discussion for reFX Nexus

Discussion: Active
18 December 2011 at 10:41am


9 March 2012 at 4:09pm


9 June 2012 at 6:18am

Still can't figure out how to get the preset packs to load, can someone help ?

11 June 2012 at 12:29am


11 June 2012 at 7:09am




31 October 2012 at 1:49pm

Oh Amazing, this is a killer VST.. ordered mine already :)

15 November 2012 at 10:24am

@ DJ.DUCEdaKEEYS go to system and add the files from the import menu

17 November 2012 at 2:43pm


20 February 2013 at 8:24pm

How do i download? :)

25 February 2013 at 12:52pm

How do I download? :D

28 February 2013 at 1:00am

U Buy It.



5 March 2013 at 10:39pm

The best one !!.

20 June 2013 at 3:43am

It Is a Powerful Synthesizer, We Love It^^.

2 July 2013 at 2:42pm

Anybody know where I can find any good reviews on this? Gotta get it, but want to read up on it a little more before shelling out $300+ Thanks.

21 February 2015 at 5:03pm

I want it.

3 December 2015 at 11:06am

finally got it yesterday with the annual Christmas discount ;) (Y)

29 June 2016 at 6:41pm

How do I get Nexus into studio one 2.

4 July 2016 at 6:34pm

I really hope you can enable moving the license from the key to computer. I'm tired of using usb hubs on the go. Other elicenser and iLok developers have achieved this, why can you?

12 December 2016 at 1:05am

Where can I buy and download nexus???? is that hard to find?

9 November 2018 at 11:16pm

I really love this, it is so helpful in music production. The developer must keep up the good work.

5 May 2020 at 5:02am

cant find.

13 February 2021 at 2:01am

The expansions were cool!! I know how to download and import to NEXUS2.

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