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I won't speak for anyone that might want to OTO your Voicebank, but the best way to learn how to oto is really to oto your voicebank yourself. It's not very hard, if you're trying to oto a CV voicebank-- a lot of people learn from mistakes and fix them, but there are tons of tutorials that can help. For starters, I've found this one to help a ton: http://yue-notebook.tumblr.com/post/22835038023/heroofbagels-it-came-to-my-attention-that-new