FAQ

I like JJazzLab and want to keep it free, how can I help ?

  • Like the videos and subscribe the YouTube channel
  • Spread the word ! Talk and add links to www.jjazzlab.com on social networks, blogs, websites, etc.
  • Participate to the JJazzLab users forum
  • Add JJazzLab translations for your own language (contact me for how to this)

Why do the backing tracks on my computer have a poor quality sound ?

JJazzLab is a Midi-based application, it does not directly produce sounds. Rather it sends Midi messages to a sound device. So the sound quality directly depends on the sound device you choose to connect to JJazzLab.

The main types of sound devices are:

  • External synthesizer or sound module : this is usually a good option to have high quality sounds with an easy setup.
  • Virtual instrument : virtual (VST) instruments can produce high quality sounds but need a more complex set up.
  • Others (usually the Windows or soundcard default GM sound bank) : this often leads to poor quality sounds. To improve sound quality you may try to use a device which can load SoundFont files, such as the built-in Java Internal Synth or VirtualMidiSynth application (Windows) or FluidSynth (Linux).

Check the online documentation for more information.

The documentation mentions a menu Tools/Options but I can’t find it on Mac OSX

On Mac OSX the Options dialog is accessed via the main menu JJazzLab/Preferences.

How to generate a .mp3 file for the backing track ?

Export the song as a .mid Midi file (menu File/Export as a Midi File) then use an external Midi-to-MP3/WAV converter. There are free converters available on the web, some of them even work online. Note that if the converter does not use the same sound bank than the one used by JJazzLab, the resulting MP3/WAV might sound different.

If you use VST instruments with JJazzLab, use your VST host (Cubase, etc.) to record the output of the VST instruments.

Can I use JJazzLab like a virtual arranger keyboard, i.e. play the chords in real time on my keyboard to control JJazzLab ?

No you can’t, JJazzLab was not designed for this purpose.

I can open a song from the examples directory, but I can’t save it (access denied error)

The examples directory is located in the JJazzLab installation directory. On systems like Windows 10, modifying the installation directory requires administrator privileges. You should use menu File/Save As and pick a directory where you have write access, like you user home directory.

How do I transpose a song ?

  • Select all the chord symbols (select a chord symbol then ctrl-A, or shift-click to another chord symbol)
  • Use the mouse-wheel, or right-click menu transpose

How to tell JJazzLab to use my own rhythm files, for example .sty/.prs Yamaha style files found on the web ?

Copy your rhythm files in the directory for user-provided rhythm files. This directory is set in the Options dialog/Rhythms tab. Upon startup JJazzLab requests all rhythm providers to scan this directory for rhythm files. You can also force a rescan using the Rescan button.

Rhythm files which could be successfully read will appear in the rhythm list of the corresponding rhythm provider. For example standard .sty Yamaha style files will appear in the rhythm list of the YamJJazz Standard Styles rhythm provider.

I don’t have administration privileges on my Windows computer, can I install JJazzLab ?

Yes. When first prompted by the JJazzLab installer, select “Install only for me”, then select an installation directory where you have write access (in My Documents for example).