NUO-STEMS 4.1 is here 🎉​

Large libraries stay responsive, long sessions hold up better, and settings are easier to change. The release is stable. Serato DJ support is in the same installer and remains alpha.

Performance​

Scrolling a large Traktor collection is smoother, and the window freezes less while you work. Reopening a collection is faster as well.

Stability​

Long sessions, including overnight runs, should crash less often. Stopping a job cleans up after itself, and quitting saves the queue before the app exits.

Easier settings​

Sum = Original is now in Quick Settings. Switching between Traktor, DAW, and Serato picks suitable defaults and asks before applying them.

Serato DJ (alpha)​

Select Serato DJ mode, add your tracks, and NUO-STEMS writes stems next to the originals for Serato DJ Pro and Lite. If stems are already there, you can keep them or generate them again. The walkthrough is in Serato mode.

The Serato extraction utility lets you preview each part and save it as an MP3, for free, without running separation again.

A few things are easy to miss:

• Keep Serato DJ closed while generating stems, then reopen it to load them.
• Restart Serato after replacing existing stems. Serato can keep the previous version cached.
• AAC and ALAC originals across macOS and Windows.
• Serato and Traktor stems are generated in separate passes.

Download NUO-STEMS or read the full 4.1.0 changelog.

If you try Serato integration, I’d love to hear how it works with your tracks. Share your feedback in Discord, or contact support if you run into a problem.

AMD & Intel GPU support and performance improvements​

With the release of NUO-STEMS 4.0.0-beta.62, performance has taken a major step forward across multiple platforms:

• DirectX 12 GPU acceleration is now supported, including AMD and Intel GPUs on Windows. Requires FL 12.0 or higher
• NVIDIA GPUs and Apple Silicon also benefit from further optimization, with typical speed gains of around 10–20%.
• On some older NVIDIA cards, such as the GTX 1650, the improvement is even more dramatic, reaching roughly 2x to 2.5x faster performance.

Benchmark Results:

Benchmark is how much faster than real-time track is processed. Higher is better. "Difference ×" is how much faster the new version is compared to the old version.

p.s. to see clean benchmark results, clear the queue after updating to NUO-STEMS 4.0.0-beta.62.

Download NUO-STEMS 4: https://nuo-stems.com/ or update in-app.

Women's Day 💐 NUO-STEMS 4 (14% discount)​

To celebrate Women's Day, here is a treat you you 😉.

Use code AINT-NO-SUNSHINE at checkout to get 14% off perpetual license.

Offer expires ⚠️ 9 March 2026 ⚠️

Download NUO-STEMS 4: https://nuo-stems.com/

20% discount for NUO-STEMS 4 for existing users 🎉​

Users who already own NUO-STEMS 3 - please check your emails from djnuo@nuo-stems.com for 20% discount code.

If you don't see it, please check your spam folder. In case you still can't find the email and you're sure you're eligible for the discount, please write me 😃.

Offer expires ⚠️ 1 March 2026 ⚠️

Download NUO-STEMS 4: https://nuo-stems.com/

NUO-STEMS 4 now has a new website 🎉 (and licensing system)​

Website: https://nuo-stems.com/

With natively linked Traktor Pro 4 STEMS🚀 and improved quality😍 of STEMS algorithms.

Took surprisingly huge amount of effort and dedication 😅.

Also, new users will experience improved licensing system. You will get license key to your email upon purchase that is then entered into NS4. No more need to install NS4 and get Hardware UUID to complete purchase 💪

Existing users who already own NUO-STEMS 3 will get emails with upgrade coupons soon in the next few days (emails are sent out gradually, so that I'm not put in spam or smth). If you can't wait to get a discount, just write me 🥳.

NUO-STEMS 4 is now in public beta​

With natively linked Traktor Pro 4 STEMS🚀 and improved quality😍 of STEMS algorithms.

NUO-STEMS 4 is now in public beta. This means that everyone is able to download it.

See NUO-STEMS 4 Docs for what's new 🎉

Existing users who already own NUO-STEMS 3 will get emails with upgrade coupons soon 😉. If you can't wait to get a discount, just write me 🥳.

p.s. updated website will come soon, as well as video tutorials.

Last chance to get maximum discount to NUO-STEMS 4 ‼️​

Starting January 1, 2026 NUO-STEMS 4 will be released as public beta.
This means that anybody will be able to download it without the need to write me.

What it also means is that it’s your last chance to get maximum discount while NUO-STEMS 4 is still in closed alpha (2 days left).

Upon beta release, users who already own NUO-STEMS 3 will get emails with upgrade coupons, but discount will be much lower.

Current upgrade price for NUO-STEMS 4 alpha is 19.99 (after coupon is applied for 40% discount from regular price of 33.99).

Public beta discount will be 20% for those who already own NUO-STEMS 3.

Please write me to djnuo95@gmail.com or in private messages to get the installer of NUO-STEMS 4 alpha.

See NUO-STEMS 4:

• Docs for what's new
• FAQ
• Roadmap
• Changelog
• Discord
• Facebook group

NUO-STEMS 4 alpha is now available on Windows, Apple Silicon and Intel Mac 💪

👉 Please write me in private messages or to djnuo95@gmail.com, and I will send you the installer 🚀

Key new features:

• Traktor Pro 4 "natively linked" stems integration
  • 
• New & improved quality of STEMS algorithms
  • 

All the discussions are actively happening in Discord: https://discord.gg/dfpk9FbvJE

You can jump in to share your proposals, feature requests etc.

See NUO-STEMS 4:

• Docs for more information.
• FAQ for more information.
• Roadmap for more information.
• Changelog for more information.
• Discord for more information.
• Facebook group for more information.

Release the kraken! NUO-STEMS 4-alpha is now fully integrated with Traktor Pro 4.

Yes, linked native STEMS! 🔥

👉 Please write me in private messages or to djnuo95@gmail.com, and I will send you the installer 🚀

Edit: now available on Windows, Apple Silicon & MacOS Intel.

See NUO-STEMS 4:

• Docs for more information.
• FAQ for more information.
• Roadmap for more information.
• Changelog for more information.
• Discord for more information.
• Facebook group for more information.

Months of hard work, millions of burned LLM tokens, sleepless nights and battle-testing in actual gigs. Now you don’t need to have 2 separate entries in your collection for original and .stem.m4a. STEMS are stored & displayed in Traktor Pro 4 as “native, linked STEMS”.

NUO-STEMS 4 works only with Traktor Pro 4. This is a deliberate decision - I want you to support Traktor team by upgrading to Traktor Pro 4. I strongly believe that 50$ (as of Black Friday deals) is a great value for what you’re getting - it’s an investment into future of Traktor.

You can still generate .stem.m4a files for Traktor Pro 3, but there are no “Traktor Utilities” to transfer metadata between originals and .stem.m4a. This also means that you can omit having originals altogether, and just use .stem.m4a in TP4 to save disk space.

Grid offset also seems improved even more (100% accuracy on my collection).

Also, as promised, all the users who purchased NUO-STEMS 3 after the date of 1 November 2025 will automatically be upgraded to NUO-STEMS 4.

My next step is to make everything work on 🔥Windows🔥, so stay tuned for that announcement.

As a reminder, we now have Discord server: https://discord.gg/dfpk9FbvJE

Features​

• New compression format: AAC 320 kbps (CBR).
  • Traktor Pro 4 introduced this format for native stems, and it's now supported by NUO-STEMS.
  • Previous AAC 256 (VBR) is still supported and remains the dafault option in NUO-STEMS. Because it provides 25% smaller file size.

• Fixed a bug when NUO-STEMS froze on 3% (crashed) on Windows when using NVIDIA GPU with < 4GB of VRAM, even if setting "GPU acceleration" to "disabled (force CPU only)".
• Fixed a bug on Windows where pressing "Stop Processing" button triggered an error (even though everything was working fine).
• Fixed a bug on Windows where if the Queue finished all tasks, it triggered an error (even though everything was working fine).

Changes:

• On startup, NUO-STEMS now shows a news modal with the latest news.

Changes:

• Fixed a bug where some .mp3 tracks couldn't be added to the queue
• Fixed a bug where loading Traktor collection caused NUO-STEMS to crash
• More robust implementation to check if Traktor Pro is running
• Improved error handling. NUO-STEMS now shows a more informative error message in the bottom right corner of the app.

It is still work-in-progress, but it's already source-available on GitHub: https://github.com/dj-nuo/nuo-stems
If you want to contribute to Docs - feel free.
In the nearest future I'm considering adding NUO-STEMS frontend code there as well for NUO-STEMS 4 (which is not released yet, and release date is unknown).

Why?
It allows those of you who are interested, to bring new UX/features to frontend or Docs of NUO-STEMS. This includes but not limited to translations. The License is completely copyright, so the goal here is just to give you tools to affect the project more as we go forward 🙂

• Expecting to squeeze even more performance than here 🤫 (for existing mel_band_roformer algorithm)
• No release date yet; not publicly available, even for testers
• New algorithm upcoming (not ready to present yet)
• Upgrade price from v3 to v4 will probably be 9.99 🙂
• ...))))

If you feel like you can help with NUO-STEMS re-design & can work in Figma - let me know 🙂 I have certain updates coming up, and want the app to feel more modern & fresh UX is a big part as well & that's my main struggle.

TLDR: UX & UI designer is welcome)

Facebook post: link

• I created a .stem.m4a file that has "silent" drums, even though the original has drums.
• Loaded into deck as standalone .stem.m4a file and tried messing with individual stem controls (volume, filter) - the track DOESN'T play DRUMS. This confirms that "sum of stems != original" when played as standalone .stem.m4a
• Generated native TP4 STEMS, and then replaced generated .stem.mp4 file with my file (including necessary file metadata to play in TP4). Result is the same: the track DOESN'T play DRUMS.

TLDR: "sum of stems != original" in Traktor Pro 4.1.1 (at least), so if you truly want to play "complete" song - you need to generate stems using NUO-STEMS 🤷‍♂️

p.s. I didn't install 4.2.0 because it has some bugs related to files relocation that cause crashing, afaik

• Traktor Utilities: now matching of original ↔️ STEMS version is done also by audio information (previously matching was only by the filename)
• Traktor Utilities: fixed a bug where even identified pairs sometimes didn’t sync
• Traktor Utilities: button is now called “Sync All” to prevent confusion with tickboxes
• Traktor Utilities: fixed bug where some pair didn’t sync due to non-latin characters
• Quality of life: NUO-STEMS on MacOS now supports differential updates. It means that you won’t need to download whole 2.5 GB every time there is an update. Instead, it will download only what was changed (e.g. 100 MB)

I advice you NOT TO INSTALL those, because they will be experimental & will most certainly break. Please wait until further notice.

Planned updates:

• Traktor Utilities. It’s UX is not great & I want to find a way to fix it. If you have ideas – let me know in the comments 🙂
• Traktor Utilities. Matching tracks by audio information (not just filename)
• Error handling. I want to implement more obvious information on what went wrong for the user without the need to send me log files. This also includes implementing an option to continue processing tracks if one fails.
• Potential memory usage improvements to STEMS Conversion process (I expect ~500-900 MB less usage than now).