You can easily achieve vocal techniques that are difficult to adjust (such as vibrato) simply by clicking an icon and then copying & pasting. These vocal techniques have been sampled from actual singers, for more realistic vocal expression.

“Emotion Tool” for easy control of vocal strength while keeping an eye on the waveform

You can use simple mouse operations to adjust vocal strength, speed, phoneme length, and other settings while keeping an eye on the displayed waveform.