User blog comment:Angel Emfrbl/Most recent popular Myth - Kaito V3's range/@comment-183.90.41.21-20130808161302/@comment-53539-20130810073340

True that, but we don't acknowledge it as its not intended to be a "append" vocal.

Luka is another "soft" vocal yet we've sighted a Soft append so far in the V2 generation. The Appends take the vocals in particular directions, soft enhances any 'softness' of the original vocals whenever a vocaloid bears this bank. The "Softness" of the original vocal is likely though a result of the fact his singer was a professional and therefore had more 'flow' in his vocal, producing smoother results in songs. The traits would have been transferred to his vocaloid vocals "Straight" vocal.