If you want to add a pause add <BREAK/ > into your text.
Example: What is 3 + 3 <Break /> 6
Or you can use <Break time="3s" /> to add a 3 second break.
Example: What is 3 + 3 <Break time="3s" /> 6
Note: Recording of Voice tags optional. Just check the box for Respond to voice tags? if you want SpokenText to respond to voice tags you have placed into your text content. Note that if your voice tags are not well formed or you have text within your content which looks like a voice tag your recording will fail to be recorded.