Although you can adjust general speed of the audio by changing the voice speed, you might want to slow down the agent’s speech only at certain points (like reading phone numbers). You can do this by prompting the LLM and generating text with - in between (note, the space around - is important): 
The number is 2 - 1 - 3 - 4
Note: The spaces around the dash (-) are important for proper pausing behavior.

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How to add long pauses

Sometimes you might want to add longer pauses to the conversation. You can do this by adding multiple - in between the words. Important: The spaces around the dash (-) are important for proper pausing behavior: 
The number is 2 -  -  -  - 1 -  -  -  - 3
// Notice the double spaces between the dashes