ConvertWithMoss 18 is out now: the new update for the free multi-sample converter brings support for Elektron Tonverk, Omnisphere 3, Roland samplers, and more.
ConvertWithMoss is a must-have tool for multi-sample users. Developed by Jürgen Moßgraber, this open-source tool allows anyone to easily convert multiple samples from one format to another.
Update 18.0 is out now, and it’s a big update with many excellent additions.
ConvertWithMoss 18
Last year, Elektron released the Tonverk multi-sampler. An exciting device, but one that still lacks a convenient sample format. Jürgen Moßgraber, however, managed to crack Elektron’s format mystery and built a converter into the new update.
With the new update 18.0, you can now convert existing multi-samples into emulti patch files compatible with the Elektron Tonverk. According to the developer, the support is still experimental as he does not have a Tonverk unit to test it on.
Another big addition is the support for Spectrasonics Omnisphere 3. Indeed, you can now create multi-sample files that are compatible with Omnisphere 3.
This too was long shrouded in mystery, but Keith Crosley cracked it, and Jürgen has now implemented it. This is a big thing for Omnisphere 3 sound designers.
Fans of vintage Roland sounds can rejoice. ConvertWithMoss 18 can now read a wide range of Roland synths and samplers from the past, including: S-50, S-330, S-550, W-30, S-750, S-770, DJ-70, DJ-70 MkII, and SP-700.
You can now import them, read them, and transform them into another format. Read support only, so you can’t create new ones for these synths or samplers.
The new update also brings loop tuning support for Ableton ADV/ADG, EXS24, Korgmultisample, Kontakt, SFZ, YSFC (partially). Other new additions are:
- processing can now up-sample as well (option: ‘Always re-sample’).
- removed renaming feature
- made settings and processing dialogs non-resizable.
Plus, there are many improvements and fixes for the various formats. You can read the full changelog on GitHub.
Another brilliant update for the open-source multi-sample converter. Many thanks, Jürgen!
The new 18.0 update is free of charge. ConvertWithMoss 18 is available now for free and runs as a standalone application on macOS, Linux, and Windows.
More information here: mossgrabers
Update from March 25, 2026
If you work extensively with samples or multi-samples, you can’t ignore the free, open-source tool ConvertWithMoss by Jürgen Moßgraber. It’s a brilliant tool that converts sample formats between formats.
At the end of last year, support was added for Maschine, allowing users to convert sample instruments from Kontakt or DecentSampler, for example, into Maschine files.
The developer has been working on version 16 for the past few months, and now version 16.5 has been released. It is particularly interesting for vintage Akai sampler enthusiasts.
Updates 16.0 to 16.5 of ConvertWithMoss bring reading support for various Akai hardware sample formats:
- S5000/S6000 AKP/AKM format
- MPC XPJ and XTY files
- Z4/Z8/MPC4000 AKP/AKM format
- MESA (*.s3p)
- S1000/S3000 series images (*.iso).
A lovely new feature is the ability to change the processing engine. For example, you can apply normalization, make the sample mono, reduce the bit depth, and more.
Alongside this, it brings support for the discoDSP Bliss sampler, UI changes, and other improvements. The full change logs are available in the official manual.
ConvertWithMoss continues to grow. I’m very happy about that. Big thanks for this.
More information here: mossgrabers
Update from November 28, 2025
The open-source, free software ConvertWithMoss is a must-have for anyone working with multi-samples in hardware and software. Since every hardware and software system uses its own proprietary format, this standalone software is invaluable.
Now, Maschine users can rejoice! ConvertWithMoss now also allows you to convert multi-samples to the Maschine (2 and 3) mxsnd format. For example, you can turn Decent Sampler patches into Maschine instruments. That’s a great addition. Thanks a lot to Jürgen!
Article from March 14, 2024
Everyone knows the situation. Great joy when a hardware or software sampler/Synthesizer offers the option of loading your samples. Even better if it can handle multi-samples. Disillusionment with importing these files.
Since the developers have not agreed on a standard common format, you must first convert them to the right one. With many different formats, this can be cumbersome. There is another way. The German developer Jürgen Moßgraber has created a free, open-source tool that makes the creation and conversion of multi-samples easier.
ConvertWithMoss
Jürgen Moßgraber’s free tool is called ConvertWithMoss. It’s not new. It is already in version 7.5. Since there was already an open-source project today, I’ll stick to the topic.
ConvertWithMoss is a free, cross-platform (macOS, Linux, Windows) tool that converts your multi-samples from a specific source to a different destination format.
Particularly amazing, and a highlight of the tool is that it has hardware and software instruments as sources and destinations. Including
Hardware
- 1010music blackbox, tangerine, bitbox (preset.xml)
- Akai MPC Keygroups (*.xpm)
- Korg KMP/KSF (*.KMP)
- Korg wavestate/modwave (*.korgmultisample)
Software
- Bitwig Studio multisample (*.multisample)
- DecentSampler (*.dspreset, *.dslibrary)
- Native Instruments Kontakt 1-7 (*.nki) – destination only Kontakt 1
- SFZ (*.sfz)
- SoundFont 2 (*.sf2) – read only
- TAL Sampler (*.talsmpl)
This lets you quickly convert multi-samples from one format to the other, such as a SoundFont in an MPC file. And with update 7.5, it now also supports OGG and FLAC format with SFZ files.
Another excellent feature of ConvertWithMoss is the ability to create multi-sample files from plain wav files. So, you can create very easily your own mapped instruments.
First Impression
This is great software that you shouldn’t miss when working with multi-samples. I hope that the EXS24 format will be added soon. It would be super handy because Logic Pro has a built-in autosampler with which you can automatically sample hardware and software instruments.
The results are saved in EXS24 format. If you could transform these EXS24 into another format with ConvertWithMOSS, that would be super great.
ConvertWithMoss is now available for free download for macOS, Linux, and Windows. It is licensed under LGPLv3, and the source code is available on GitHub.
More information here: mossgrabers
Nice!
Maybe that’s going to make the wavestate fun for me? I’m bot a fan of plowing through those endless samples in that synth/vst. Let’s see how easy it is to make a sample yourself with that software, because the tutorials on Youtube taught me what a hassle that was…
Support for Emulator x3 .exb format would be epic too! Such timeless libraries, also has the auto-sampling feature of EXS24..
Can this convert all the protected Kontakt 3/4/5 libraries I’m sitting on so I could use them with Live’s Sampler?!
no, your sentence already contains the answer to this question: “protected” 😉 Protected means, the developer has locked the sample content. There are libraries with uprotected content. In this case, you can find the samples in a folder
Do you think we’re getting closer to a universal multi-sample format, or will tools like this always be necessary?
I’m more on the side that we always need tools like tis 🙂
Absolute outstanding work done here by Mr. Moßgraber!
However, it seems grotesque that musicians in 2026 still have to fight with so many sample formats. The PDF of multisamples is long overdue. Native Instruments could have been that, but of course with the greedy licensing many developers where put off.
This is material for so many journalists, but most of them ignore this issue completely. Mr. Synthanatomy, please lead!
Or you simple don’t check before writing stuff. An entire article about Kontakt Player, fees and why there are some few Player compatible instruments.
https://synthanatomy.com/2023/02/native-instruments-kontakt-player-why-are-there-so-few-free-and-commercial-releases.html