Synth-ex is an example of the kind of intelligent reasoning device which might begin to overcome some of the shortcomings of current synthesis systems in choosing among options. The intention here is to illustrate that a minimum level of 'reasoning' in a synthesis system can point to a way of dealing with the defects noted. Synth-ex focuses on the second problem. Environmental sensitivity is distinguished from linguistic context-sensitivity in the sense that information external to the linguistic system is used in the decision making process. Neutral means that the speaker has a neutral attitude toward what he is saying.
Citation refers to an intention to highlight a phrase or word.
Expectation means that the speaker will speak as though his utterance could be predicted by the listener. Surprise is how a speaker would communicate surprise to the listener. Contrast involves a pronunciation which highlights a difference in meaning with a similar word or phrase. Precision means that the speaker pronounces the word more carefully than usual. These then are six ways of pronouncing an utterance, and for the purposes of the demonstration, of pronouncing a single word 'cat' at the end of a sentence.