Kagamine Rin/Len ACT2 was originally built to fix the flaws of their previous release. Unfortunately, this package seemed to of done more harm than good. These vocals are very difficult to use. I don't know how but they sound both "choppy" and "mumbly" at the same time! They lack the power and clarity of their previous release. To be honest, it's best if you skip this one and go straight to their V4X package. Now that that's out, you don't need to get their Appends which fixed up alot of the problems with this package.