How can I Correct the Pronunciation of a Word in my Vantage/Vanguard?
You can correct your device's pronunciation of a word by using the Dictionary Menu in the Toolbox.
Adding Words to the Dictionary
Add words to the Dictionary to teach your device how to pronounce them correctly. When you add words to the Dictionary, first you spell them correctly. Then you spell them the way you want your device to pronounce them.
For example, names of foods from other countries are usually mispronounced in English speaking devices. "Fajita" is a good name to practice with.
To Add a Word to the Dictionary:
1. Go to the Toolbox.
2. Activate the DICTIONARY MENU. 
3. Activate the Add a Word key.
4. Spell the word you want to add. Spell it correctly. In this case you would spell, "fajita".
5. When you have finished spelling the word correctly, activate OK.
6. Now spell the word the way you want it to be pronounced. This means typing the word the way it sounds. You may want to try out different spellings until your device pronounces the word the way you want. Activate the text display area of the screen to hear the word pronounced. You will probably end up with a word that looks something like, "fah hee tuh."
7. When you are satisfied with the pronunciation, activate OK.
8. You can continue to add words, delete words or review words. If you are finished with the dictionary, activate OK.
NOTE: Some words can be pronounced two ways. For example, "record" can be pronounced reCORD and RECord. DECtalk and RealSpeak will look at the sentence where the words like these are contained and try to pronounce them correctly. Most of the time they will get the word right.
Words with alternate pronunciations should not be added to the Dictionary unless you always want them pronounced in one way only.