Checkpoint 4.13 : Configure synthesized speech features
Provide support for user-defined extensions to the synthesized speech dictionary.
Provide support for spell-out: where text is spelled one character at a time, or according to language-dependent pronunciation rules.
Allow at least two configurations for speaking numerals: one where numerals are spoken as individual digits, and one where full numbers are spoken.
Allow at least two configurations for speaking punctuation: one where punctuation is spoken literally, and one where punctuation is rendered as natural pauses.