I noticed this icon, but never bothered with it until now. In Outlook there's a "read aloud" icon. It will read your email out lout. It pauses after each word a bit, but it is fast. Might be an idea if you need more dictation practice. Open up those long text sales ones.
"Gregg Shorthand had achieved the most extraordinary success ever attained by any system in the history of shorthand." John Robert Gregg, 1922