SAPI Symbol Usage for Speech Dictionary Input

Question

I've been doing some work to add words and pronunciations to the Windows speech dictionary via the SpLexicon Interface of SAPI 5.4 (which I think is the only way to do it) via the AddPronunciation function, or in my case:

// Initialize SpLexicon instance
SpLexicon lex = new SpLexicon();

// Specify the word to add to the speech dictionary
string myWord = "father";

// Set the language ID (US English)
int langid = new System.Globalization.CultureInfo("en-US").LCID;

// Specify the word's part of speech
SpeechPartOfSpeech mySpeechPart = SpeechPartOfSpeech.SPSNoun;

// Specify the word's pronunciation in SAPI phone symbols
string myPronunciation = "f aa dh er";

// Call actual speech API method for adding word data to the speech dictionary
lex.AddPronunciation(myWord, langid, mySpeechPart, myPronunciation);

I'm referencing the American English Phoneme Table for determining what SAPI symbols to use. I've noticed though that using the emphasis markers "1" or "2" as well as the syllable marker "-" doesn't seem to affect the TTS pronunciation. Are these modifier symbols only used for XML input, or am I possibly doing something wrong?