To insert a pause between words or sentences type [PAUSE=S] where S is the number of seconds.
For example: "How are you?[PAUSE=3] I am good."
The voice will make a 3 second pause after "How are you?" before it reads the next sentence.
To give more control over the pause timing, you may also use a decimal point to add milliseconds
For example: "How are you?[PAUSE=3.5] I am good."
This will give a 3.5 seconds pause which is equal to 3500 milliseconds