JJazzLab 5.0.1 (Nov. 26, 2025)

JJazzLab Dark JJazzLab Dark JJazzLab Spain Demo    

New features 5.0.1

  • New jjSwing rhythm/style with realistic walking bass and drums
    The ultimate style for practicing jazz standards. Requires Fluidsynth.

  • Track overrides
    This new rhythm parameter lets you use tracks from different rhythms/styles in a song part.

  • Customizable chord progressions
    Define your own chord progressions and easily insert them.

  • Chord auditioning and improved chord type selection
    Use ctrl+shift click on a chord symbol, or press M to audition all the selected chord symbol.

  • Quickly hide a rhythm parameter
    Use the new hide button (X) directly in the rhythm parameter.

  • Chord display transposition for sax players (or other transposing instruments)
    Actual music is unchanged but displayed chord symbols are transposed.

  • User tracks can now be muted in song parts

See the 5.0.1 RELEASE NOTES for more details and the complete list of changes.

Download

If a problem arises when installing JJazzLab see the detailed installation instructions in the online documentation.

Windows

Download and run: JJazzLab-5.0.1-Win64-Setup.exe

If you get a Windows security popup when running the installer, this is normal: the installer was not “signed” with a developer certificate.

Why? This would cost me about 100$/year. JJazzLab is 100% free with no ads, I just can’t.

JJazzLab is NOT a malware! You can use the SHA256 key available here to check the downloaded file integrity.

To run the installer, just choose Run anyway.

Mac

You must first install FluidSynth yourself (version >= 2.2.0, I recommend via homebrew).

Then download and install:

Consult the installation instructions for MacOS for more details.

If MacOs prevents you from opening the .pkg file for security reason, this is normal: the .pkg file was not “notarized” via the Apple process.

Why? Doing the notarization process would require me to pay 100$/year to Apple and to buy a MacBook. JJazzLab is 100% free with no ads, I just can’t.

JJazzLab is NOT a malware! You can use the SHA256 key available here to check the downloaded file integrity.

To open the .pkg file anyway, go to Systems settings/Privacy & Security, scroll-down to the Open anyway button, as explained in this Apple online doc.

Linux Ubuntu/Debian family (x64)

Download the .deb file and install it as shown below.

jjazzlab_5.0.1-1_amd64.deb

sudo apt-get install ./jjazzlab_5.0.1-1_amd64.deb    # this will also download and install fluidsynth (>=2.2.0) if required

If FluidSynth makes some “crackling” noise, make sure your Linux is optimized for audio applications.

Linux OpenSUSE family (x64)

Download the .rpm file and install it as shown below.

jjazzlab-5.0.1-0.x86_64.rpm

sudo zypper install ./jjazzlab-5.0.1-0.x86_64.rpm      # this will also download and install fluidsynth (>=2.2.0) if required

If FluidSynth makes some “crackling” noise, make sure your Linux is optimized for audio applications.

Linux others (x64)

You must first install FluidSynth (>=2.2.0) yourself.

Then download and extract the tar.xz file as shown below.

JJazzLab-5.0.1-linux-x64.tar.xz

tar -xf JJazzLab-5.0.1-linux-x64.tar.xz

Run file bin/jjazzlab to start JJazzLab.

If FluidSynth makes some “crackling” noise, make sure your Linux is optimized for audio applications.

Consult the INSTALLATION INSTRUCTIONS ON LINUX if required -distribution on the many Linux distros is not always easy…

Free and open-source software

Contribute to the code on GitHub.

If you’re not a developer, you still can help:

Acknowledgements

Let us be grateful to the people and projects that are or were a part of JJazzLab, or those who had contributed to it in some way.