Clownfish Voice Changer is a program that can be used to modulate one's voice. Unlike many other Soundboards, it is installed at a system level. Therefore, many applications such as Skype, Discord, Hangout, etc, basically any app that uses Microphone. There are a dozen of Voice effects such as Alien, Clone, Atari, Robot, etc. So, you can always modulate your voice and not make your voice monotonous.