The working principle of these programs is the alteration of the timbre is unrecognizable. You can speak with the voice of a person of another gender, age, nationality, apply effects, presence in a certain place, etc.
The first of these programs – "Fake voice". Install it from the link below, run it and open settings. Choose the tone, effects, and features fake voice according to your desire.
The second program – Scramby. A link to the installation file is also provided. The set includes 23 of the timbre of voices and 46 additional effects. You can turn on and off sounds that simulate a particular environment. For use in programs that support voice chat settings (for example, "Skype" instead of the default sound card, use the virtual – Scramby.
Programs of this kind applies Voice Changer. After installation, select the program skin, pull the levers and set the tone that you like.
When working with programs make sure that the microphone connected to the sound card.