You can always speak the contents of the vocalization window by hitting anywhere within the region. Hitting multiple times will repeat the vocalization each time.
Repeats: From Vocalization Menu
You can adjust the voicing of your phrase when you repeat it by opening the menu in your vocalization box and selecting "repeat."
From the "repeats" menu you can choose to speak more quietly or more loudly and can also choose to flip the text to allow someone one the other side of the device to read it more easily.
Hitting the "button" option will create your phrase as a larger button that you can share, flip, or view as needed.