> For the complete documentation index, see [llms.txt](https://docs.plumvoice.com/fuse/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.plumvoice.com/fuse/application-editor/application-settings/language-settings.md).
# Language Settings
####
This section allows users to define and modify an application's language settings.
**1. Default Language**: If an application on has one active language, that is automatically the default language. If an application has more than one language, users can select a different default language using the drop-down menu. Fuse only lists languages active in the application in the drop-down menu.
**2. TTS Engine**: Users can select their preferred text-to-speech (TTS) engine from the options available in the drop-down menu. As of Fuse 7.5, Amazon Polly is the default TTS Engine option.
{% hint style="info" %}
**Note:** Not all TTS engines are available for all languages. If users select a TTS engine that is not compatible with all of the languages present in a given application, then the drop-down will be blank.
{% endhint %}
**3. TTS Voice**: Based on the options available from the TTS engine, users can select the different voices for each of the active languages in an application. Select the desired voice for each language from the options in the drop-down menu. *Note*: Some languages do not provide multiple voice options. To view a complete list of available TTS voices, visit the [Text-to-Speech](/fuse/application-editor/application-settings/language-settings/text-to-speech-tts-options.md) page.
---
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