What do you mean by "ten years ago"? Yamaha Corporation produces vocal synths since 2000s, but it is quite pointless to use technologies of Vocaloid 4 if you ca

What do you mean by "ten years ago"? Yamaha Corporation produces vocal synths since 2000s, but it is quite pointless to use technologies of Vocaloid 4 if you can use Vocaloid 6.