Velleman voice changer kit velleman mk171 the voice changer kit from velleman is a high quality kit that will help to disguise your voice you can add a vibration to your voice like the effect used to protect the identity of crime victims and witnesses there are numerous ways of using this superb kit change your voice tone upward or downward or create different voices to make voice overs and voice dubbing for audio video clips br velleman mk171 voice changer kit