Hello! Kumi Act 4 is a Hiragana-encoded VCV voicebank. There are several methods to use VCV voicebanks.
If you are using Original UTAU, the .ust will need to look like Figure A shown below.
If your .ust is in CV (figures B & C), it will need to be converted to Default VCV in Hiragana. This is done easily with the "irorio" plugin, found here:
https://utaforum.net/resources/bizzs-utau-plugins.129/
Alternatively, VCV can be used with Hiragana & Romaji CV input using a tool called "Presamp", found here:
https://utaforum.net/resources/presamp.492/
To use "Strong" and "Whisper" extensions, simply add the suffix "S" or "W" to the desired lyric box.
Example: [ - か ]
→ [ - かS ] or [ - かW ]
Don't forget to clear the STP and reset the envelopes before playing the .ust!
http://utau.us/fitust.html
View attachment 12032
If you are using OpenUTAU, Hiragana & Romaji CV input can be used by simply selecting the "JA VCV" Phonemizer. "Strong" and "Whisper" extensions are used the same way, by adding suffix "S" or "W" to the desired lyric boxes.
View attachment 12033
If you're still having issues, you may need to switch your computer's Locale to Japanese if you have not done this already, and then redownload the voicebank.