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Don't use it when you're trying to be serious. It should just be for good fun, something to make people smile at a cute robotic voice. Honestly, if you want to sing, just train your voice. Perfect pitch is a memory game. You can remember a song perfectly in pitch if you practice it long enough. Just don't use an oid. It's like musical aids. xD
Some people do it for internet-fame, but all in all...don't do it. If you're doing music for fame, then you'll just fall like a lot of people do. People who are famous in music love people hearing their music, but they work hard for that. When you're going the easy route, it's a slap to the face to the -serious- folks. So, please, don't use it. It's not a natural thing to do anyways.