It might work – not an empty dictionary, but a dictionary that only has Rejecto syllables in it may give you the desired results. I’d recommend putting at least one word in there (like “Ah” or a similar syllable sound) to avoid any error checking against blank entries, then use Rejecto to generate the model and see what SaveThatWave picks up for you. You should probably make secondsOfSilenceToDetect a bit longer so SaveThatWave doesn’t attempt to separate the utterances by syllable.