User blog comment:Angel Emfrbl/Extra vocals XSY and all that.../@comment-27092909-20151202220239/@comment-53539-20151202224214

Its kinda odd, but the group most using it is the XSY modders. They enjoy mixing vocaloid X with Y that weren't intended to be mixed. When you consider if the voicebanks are two different the calculations become off, there isn't too much to say. XSY is really intend to be the bridge between the two vocals, allowing you to ease slowly (or not) between two vocals, its not really suppose to be abused to create entirely new voicebank-esque results. The fact you can is another thing.

The language mixing of modders is by far the least impressive results. TI feel the XSY function is about the most impressive tool for V4 on offer, but especially for those who are modding it, they don't always realise their getting really bad results. If anything, many sound like V1 vocals.