BTW, please keep in mind that Rejecto, like any other OOV solution, can’t give perfect rejection results – the goal is to minimize out-of-vocabulary recognition but it isn’t possible to make OOV recognition 100% nonexistent without affecting in-vocabulary recognition (even Siri will catch incidental noises and extraneous speech and recognize it sometimes). If you have very specific OOV words which are frequently mistaken for in-vocabulary words you can also add them to the active model and then ignore them in hypotheses.