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JJazzLab 3.0.2a (Jan. 08, 2022)

JJazzLab Dark JJazzLab Spain Demo    

New features

  • Dark Theme with improved graphics
    The Light Theme is gone -it was too much work to maintain 2 themes.

  • Auto-update of the playing backing track
    No more need to stop and restart the playback in order to take into account changes made while the song is playing.

  • New Drums Transform rhythm parameter
    For example make the hi-hat louder in the intro song part, or add a tambourine phrase in 1-click.

  • New Custom Phrase rhythm parameter
    For example use your own bass line for the chorus song part.

  • Notes viewer
    See notes of the selected chord symbol on a piano keyboard or using guitar diagrams. See real-time notes from the backing track.

  • User tracks
    For example add a melody to your song.

  • (Pseudo) Arranger keyboard mode
    Select a song part, press the Arranger Play button and JJazzLab will recognize the chords received on Midi input and update the backing track accordingly.

  • Improvisation help
    JJazzLab generates guidelines in your chord leadsheet for selected improvisation exercises.

  • Midi input and remote Midi commands
    You can trigger music control actions (play, stop, …) from any Midi input sequence via Midi Learn.

  • New languages Spanish and Brazilian/Portugese
    plus the usual English, French, Chinese, German

  • And many more…
    Adjust audio latency, new keyboard shortcuts, Midi file drag & drop support, jump playback to next/previous song part, etc.

See the RELEASE NOTES for more details and screenshots about the new features.


Windows 32-bit version: JJazzLab-3.0.2a-Win32-Setup.exe

Windows 64-bit version: JJazzLab-3.0.2a-Win64-Setup.exe

Linux x64:

Mac OSX:

If you get a Windows Smart Screen alert, click on More info, this will let you run the installer anyway. JJazzLab is NOT a malware!

Because version 3.0 is brand new, Windows security servers don’t have enough statistics to evaluate its “security reputation”. Alert will disappear soon, once enough people have run the software.

Recommended downloads to get the best out of JJazzLab 2 :

JJazzLab SoundFont: JJazzLab-SoundFont.sf2

VirtualMidiSynth soundfont player: VirtualMIDISynth (for Windows users only)

Installation instructions


Free software !

You can use JJazzLab for free as long as you agree to the terms of the End User License Agreement. JJazzLab contains open source components (see below) governed by specific licenses which are available (with source code) via the JJazzLab-X project.


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.