Audiovox SMT 5600 / SPV C500 (HTC Typhoon)

Does anyone know where the voice tag files are stored so I can manually delete them? I noticed that when I delete them from the speed dial application they are deleted from the list and from the contacts but if you activate voice command and say something that should have been deleted, it is still recognized (you hear your previous recording) but no number is dialed. If you record the same name again - sometimes it will still recognize the old one and not dial any number. Any ideas?