A modifier is Speech Markdown that changes the way a specific word or phrase is spoken.
The typical format of a modifier is: (text)[key:"value";...]
Not all modifiers have a value. Multiple modifiers can be applied to the same text.
This is some (content with modifiers)[volume:"loud";rate:"slow"]
A (moderate)[emphasis] level
The word is spelled: (hello)[characters]
The date is: (10/11/12)[date:"mdy"]
Modifiers can include the following markdown: