| Platform SDK: Agent | 
| Part | Description | 
|---|---|
| string | A string specifying the character of the voice.
 "Normal" (Default) A normal tone of voice. "Monotone" A monotone voice. "Whisper" A whispered voice.  | 
This tag is supported only for TTS-generated output. The range of values for the parameter may vary depending on the installed TTS engine.