VOCALOID4 Editor for Cubase
Have you selected a single part?
Add a track, create parts, select the part you want to open in VOCALOID4 Editor, and then open the "MIDI" menu.
VOCALOID4 Editor cannot be opened for two or more parts at the same time.
If you are unable to find a solution in the Troubleshooting section, please use the Inquiry Form to submit an inquiry.