Regarding Support for VOCALOID for macOS 12 Monterey(Updated 19. Nov 2021)

Use of VOCALOID Editor Version 5.6.3 or later is now supported on macOS 12 Monterey.
Please update to the latest version before using.
However, please check the macOS 12 Monterey support status of any DAW you may use when using VOCALOID5 in conjunction with VTS/AU (Audio Units).

When using VOCALOID5 as an AU plugin in Logic Pro X / GarageBand on a Mac with Apple silicon, please select the setting "Open using Rosetta" for Logic Pro X / GarageBand.
Details on changing this setting can be found on the following support page from Apple.
*We have confirmed an issue with the VOCALOID4.5 Editor for Cubase in which some characters do not display correctly in the menu in macOS 12 Monterey.
If you are using macOS 12 Monterey, please be aware of this when running the VOCALOID4.5 Editor for Cubase.