We've completed the operation verification on macOS 26 Tahoe with following products.
The products listed below are now supported.

VOCALOID6 : ver 6.10.0 or later
VX-β：ver 3.0.3 or later
VOCALO CHANGER PLUGIN : ver 1.2.1 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 15 Sequoia and macOS 26.
Thanks for your understanding.