All-in-One Voice Changer is an interesting audio application which can play prank calls online on your friends. When you are speaking with your friends through IM tools such as Skype, Yahoo Messenger or QQ International, it can change your voice pitch in a funny way during the call. You can also use it as a dubbing tool to dub funny videos in your way. All-in-One Voice Changer is based on Skype Voice Changer of AthTek Software, thus they have the same interface. When you start All-in-One Voice Changer, it may ask you to confirm the connections to IM tools. You can test the voice pitch to find your favorite voice pattern, and use it in the call. You can also import an audio file and change the voice pitch in it. The audio file could be in *.wav, *.wma, *.ogg, *.flac or *.mp3 file format. With a microphone, you will be able to change and record your voice in a *.wma file. If you are looking for an application which can play prank calls on your friends, All-in-One Voice Changer will be the best choice for you. If you just want to have a free voice changer, you can find another one in our official website.