This app need some understanding.

There was no mention about connecting issue. At first time, I thought that this app doesnt work.
To use this app, connect headphone jack which both ends are same male jack with other devices such as speak or PC.
Talking folks with other voice is possible while using Skype or other internet phone software. After connecting iPhone headphone jack and mic jack in PC, execute this app. You can communicate with somebody with changed voice.

Rachael King about VoiceDisguiser