Talk:MAYU/@comment-99.233.108.67-20120519173128/@comment-53539-20120521163303

They can start producing demos when a vocal reaches 40% of production, since its about then there is enough of the vocal to construct whole sentances. At 70% all the basic sounds are in and all thats left are the bonus sounds that smooth out the vocal and give those little details.

Then again, this is only based on Miku English progress, but it gives you an idea on what things are like vaguely at any stage.