# Using FluidSynth

JJazzLab bundles a **ready-to-use** Fluidsynth instance **optimally configured**. 

FluidSynth should be enabled by default when you first launch JJazzLab on Windows. 

On Linux and MacOS, it requires that FluidSynth was previously installed on the system. 

{% hint style="danger" %}
If FluidSynth appears disabled, it means that a problem occured while trying to load FluidSynth. Check the [**installation instructions**](/user-guide/installation.md)**.**
{% endhint %}

<figure><img src="/files/pHj9KlW002DpYq37FRW3" alt=""><figcaption></figcaption></figure>

You can define FluidSynth **default instruments** to be used by JJazzLab when a new rhythm is used in a song.

### FluidSynth settings

<figure><img src="/files/QJkwfJRBGNPQ0GEb9B3N" alt=""><figcaption></figcaption></figure>

{% hint style="warning" %}
Changing the default FluidSynth audio driver is **not** recommended. However on Linux, in some cases, it might be useful to solve an audio configuration issue.
{% endhint %}

### FluidSynth open-source project

More info at [https://www.fluidsynth.org](https://www.fluidsynth.org/).


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