User blog comment:AcobraL/Thoughts on Planty's Chika comparison video/@comment-25147000-20140914003233/@comment-3076833-20140914153138

^ That's why i'm always "No vocal is useless" when it comes to them. We already know that Chika will have a larger range than Gumi and that she's even being given more phonetic data to perfect Japanese. Of course they could always try this sort of thing with Gumi but Gumi can't do everything, if kokone's existance isn't proof enough they can't falsetto Gumi for instance. Chika not only provides a new-ish voice (new in the sense that it's from a new VA at the least) but will most likely perform better than Gumi in what they're experimenting on her. If anything "appends" are more useless than new VA'd vocals because it's more excuse to re-sell the new voice other than get a VA who can perfect the tone they're going for.