User blog comment:Manocster1/Quiz Time/@comment-5665682-20160619054247/@comment-29714788-20160621010925

I think it's also because their vbs don't have lower keys recorded, so when Vocaloid pitches down samples it creates engine noise and sounds distorted. But I don't think it has anything to do with the age of the voice, because VY2 is a young male voice but has a deep tone.