16. A method comprising: detecting, by at least one processor, occurrence of an out-of-vocabulary word in a text sample to be converted into audio output by detecting that the out-of-vocabulary word is not located in a lexicon associated with a default language; determining a probability that the out-of-vocabulary word will be mispronounced using a text-to-speech synthesizer; in response to the probability that the out-of-vocabulary word will be mispronounced being below a first threshold probability, producing, via a first text-to-speech synthesizer configured to generate audio in accordance with the default language, a first audio output of the entire out-of-vocabulary word and any words in the text sample that are located in the lexicon associated with the default language; and in response to the probability that the out-of-vocabulary word will be mispronounced meeting a second threshold probability, producing, via a second text-to-speech synthesizer configured to generate audio in accordance with a foreign language, a second audio output of the out-of-vocabulary word.
16. A method comprising: detecting, by at least one processor, occurrence of an out-of-vocabulary word in a text sample to be converted into audio output by detecting that the out-of-vocabulary word is not located in a lexicon associated with a default language; determining a probability that the out-of-vocabulary word will be mispronounced using a text-to-speech synthesizer; in response to the probability that the out-of-vocabulary word will be mispronounced being below a first threshold probability, producing, via a first text-to-speech synthesizer configured to generate audio in accordance with the default language, a first audio output of the entire out-of-vocabulary word and any words in the text sample that are located in the lexicon associated with the default language; and in response to the probability that the out-of-vocabulary word will be mispronounced meeting a second threshold probability, producing, via a second text-to-speech synthesizer configured to generate audio in accordance with a foreign language, a second audio output of the out-of-vocabulary word. 17. The method as in claim 16 further comprising: utilizing the first text-to-speech synthesizer to produce an audio output of at least one word other than the out-of-vocabulary word in the text sample; utilizing the second text-to-speech synthesizer to produce the second audio output of the out-of-vocabulary word; and combining the audio output of the at least one word and the second audio output of the out-of-vocabulary word to produce an audio output.