User blog comment:V3-CHAN/Ruby or CYBER DIVA?/@comment-5051846-20150130085524

Ah, the 'Witness' cover is not how Ruby sounds now, it was how she sounded early in production. Although the 'Witness' cover was discovered after the 'Problem' sample, it was actually made in December 2013 – hence the single pitch and missing phonemes. orz 'Problem' is the most up to date sample we have of Ruby. ( ´ ▽ ` )ﾉ

http://www.vocaloidotaku.net/index.php?/topic/36197-vocaloid-general-discussion/page__st__10410__p__1228118&#entry1228118