DoNaut is a voice changing software available for windows for free. Change and add effects to your voice, sound like anything before. Share your favourite music when you calling your friends. Add background sounds and sound effects to your phone conversation. Text to speech, you write, your friends listen. You can also use DoNaut to download free phone signals and sound effects as WAV, MP3 or OGG files. DoNaut gives you the possibility to twist and turn your voice in a wide range.