This only occurs with the NeoSpeech voices. It is because of a default setting in the user dictionary. You can change it by opening a dictionary editing program called userengdic.exe located in C:\Program Files\Zabaware\HalReader\Kate\lib and then open the file C:\Program Files\Zabaware\HalReader\Kate\data-common\userdict\user_eng.dict and remove all the "beep" words. You must do the same for the Paul voice by editing C:\Program Files\Zabaware\HalReader\Paul\data-common\userdict\user_eng.dict