What are the append versions of vocaloids?

Append vocaloids are additional voice libraries that can be purchased and added to existing vocaloid software, expanding their vocal range and expressiveness.

For example, the vocaloid Hatsune Miku has several append versions available, including:

- Append: This adds a sweeter, more gentle voice to Miku's original voice.

- Soft: This gives Miku a softer, whispery voice.

- Vivid: This makes Miku's voice more clear and crisp.

- Dark: This adds a darker, more mature tone to Miku's voice.

Append vocaloids can allow producers to create a wider variety of vocal sounds and styles with their software.