FluidSynth (Linux/Mac)
FluidSynth is a free and efficient SoundFont player for many platforms. We recommend it for Linux and MacOS.
FluidSynth can redirect its output as a .wav file. This can be used to get a JJazzLab backing track as an audio file. See the FAQ for more info.

  1. 1.
    Download JJazzLab-SoundFont.sf2 from the Musical Artefacts web site
  2. 2.
    Install a virtual midi port
    $ sudo modprobe snd-virmidi midi_devs=1
    Previous command will work for the current session only. If you want to permanently add the virtual midi device (jack users on Debian/Ubuntu/Mint), edit the /etc/modules file to add snd-virmidi, and create a file /etc/modprobe.d/snd-virmidi_options.conf with the content options snd-virmidi midi_devs=1.
    If you list the connected ports, you should see a new Virtual Raw Midi entry like below:
    $ aconnect -lo
    client 14: 'Midi Through' [type=kernel]
    0 'Midi Through Port-0'
    client 20: 'Virtual Raw MIDI 1-0' [type=kernel,card=1]
    0 'VirMIDI 1-0'
  3. 3.
    Install FluidSynth and QSynth, its graphical user interface (tested OK on Linux Mint, if problem please consult the FluidSynth documentation)
    $ sudo apt-get update -y # Get latest packages info
    $ sudo apt-get install fluidsynth
    $ sudo apt-get install qsynth
  4. 4.
    Start QSynth
    qsynth &
  5. 5.
    Load the JJazzLab SoundFont and adjust FluidSynth settings
  6. 6.
    Connect the virtual port to FluidSynth You should see a new port, like in the example below:
    $ aconnect -lo
    client 14: 'Midi Through' [type=kernel]
    0 'Midi Through Port-0'
    client 20: 'Virtual Raw MIDI 1-0' [type=kernel,card=1]
    0 'VirMIDI 1-0 '
    client 128: 'FLUID Synth (Qsynth1)' [type=user,pid=3099]
    0 'Synth input port (Qsynth1:0)'
    Connect the Virtual Port to the entry of the FluidSynth:
    $ aconnect 20:0 128:0 # Values might be different on your system
    This connection needs to be restored each time the FluidSynth engine is restarted.
  7. 7.
    In JJazzLab go to Options/Midi and select the first virMIDI out device
  8. 8.
    Go to the output synth editor and apply the preset FluidSynth
The start of FluidSynth with the virtual Midi port can be automated via a shell script.
On Linux the Midi configuration wizard will automatically perform step 8 if you choose to use the JJazzLab SoundFont.
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