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UTAU voice banks won't make certain sounds

CarvedHeart:3

Making Teto Music :3
Jul 29, 2026
3
I'm VERY very new to vocaloid production, and I've had an oddly specific problem regarding UTAU that I can't find a solution to anywhere :/

I'm using a Kasane Teto voice bank on whatever the current version of UTAU (not OpenUTAU) is, and for some reason certain lyrics just won't play when pasted in. For example, I'll paste in 雨雲の灯りで瞳をつないで, put it in, and it won't play 雨雲, 灯, and 瞳, but everything else will play just fine. If it has to do with those characters just not being in the voice bank, is there any way to at least mimic those characters?
 
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Rylitah

kiyoteru enthusiast
Staff member
Moderator
Apr 8, 2018
617
To explain why this is the case, UTAU is an old program made by a single developer (Ameya) - it doesn't have the capability to know what lyrics you're inputting when you type in kanji since kanji can have different readings/pronunciations and mean different words depending on the context (which the program can't understand).

When you input a note, you're essentially just telling the program to play the specific recording that corresponds with the sound you write down at that time, at that pitch. UTAU banks are comprised of recordings of a bunch of sounds and not words, so the notes you put down are you essentially splicing together a bunch of those recordings/sounds to make the words. This is also how Vocaloid works (at least pre-V6/AI), but that program has the capability to pull the sounds together to form whatever word you type in - not the case with UTAU.

You'll have to split the notes in half (or more) to properly fit all the sounds that make up the word you're trying to get Teto to say. It's a bunch of trial and error, especially since UTAU is so archaic at this point (just a fact, not necessarily a diss since many people still prefer working in it), but once you get the hang of it and get why it's like that it makes a lot more sense!
 

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