Board Thread:General Discussion/@comment-25563055-20141024231726/@comment-53539-20170618192133

Yamaha sold a error-prone englist for starters which either caused unneeded sounds or the wrong sounds recorded. Another was use of British accents which produce softer vowels compared to the American accents. Also, more experience lead to better vocals later on.

Strictly speaking, you can understand a voicebank for Vocaloid when about 60% of the samples are included. The final 40% are individual sounds that smooth out aspects of the vocal. The voice is normally more solid and less smooth at this stage which can create the same impact the Japanese vocals used for English can create. You have more clarity due to this, but there is a lack of quality without the smoothness. Its basically the same situation the "Power" versus "soft" voicebanks are in... Wherein Power types tend to have more of the clarity traits but struggle with quality, while soft have more of the expression but have looser vocals that often end up being HQ.