Can you point me to something that explains how “Rejecto syllables” work?
No, sorry. My suggestion should be understood as just using Rejecto normally but with the smallest possible vocabulary. It isn’t necessary to have null hyps returned since you aren’t doing anything with returned hypotheses.
I don’t suppose there’s a way to tap into your recognizer to get the audio bits as they arrive?
Sorry, there’s no hook for using the buffers directly. However, secondsOfSilenceToDetect will affect how much silence/statement completion is listened for before an utterance is considered ‘done’ so that might be worth some experimentation.