We've completed the operation verification on macOS 14 (Sonoma) with following products.
The products listed below are now supported.

VOCALOID6 : ver 6.2.2 or later
VOCALO CHANGER PLUGIN : ver 1.1.0 or later
VOCALOID5 : ver 5.7.2 or later

We've found some problems with VOCALOID4.5 Editor for Cubase and lower versions.
These products are not supported on macOS 14 Sonoma.
Thanks for your understanding.