About SSML Controls in Prompts

Working with Prompts > About Prompts in Dialog Designer > Prompt Controls > About SSML Controls in Prompts

	About SSML Controls in Prompts

For the TTS-based prompt segments, Text Variable items and TTS items, SSML controls are used to refine the way the TTS engine renders the text.

Note:

The TTS engine must be SSML-compliant for these controls to work. Dialog Designer uses the Microsoft SDK TTS engine which is not SSML-compliant; these controls are ignored during testing.

Using SSML controls allows the following functionality in prompts:

Insert or eliminate breaks, or pauses, in the flow of the speech. See Break.

Increase or decrease the amount of emphasis on words or phrases. See Emphasis.

Use markers to detect barge-in during TTS playback. See Mark.

Vary and control the pitch, rate, duration, and volume. See Prosody.

Determine the way in which a word or phrase is interpreted. See Say As.

Set the age and gender of the synthesized voice used for text rendering. See Voice.