> For the complete documentation index, see [llms.txt](https://doc.sysdevmobile.com/kalipso5/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.sysdevmobile.com/kalipso5/developing/form/actions/actions-description/group-voice/native-voice-message-settings.md).

# Native Voice Message Settings

Changes the synthesizer output volume and speed.

Action available for the following operating systems:

![](/files/-MMLyQTNWLRK7nJlrbHY)

### Parameters

* **Speed** *\<numeric> -* The output speed. 0.5 is half the normal speed, 1 is normal speed, 2 is twice the normal speed, N is N times the normal speed.
* **Volume** *\<numeric> -* Volume level from 0 to 100%.