UTAUloids, similar to VOCALOIDs, are practically virtual/digital singers. To make an UTAUloid, a user would record samples of themself saying strings of syllables or phonetics in almost any language at a constant pitch. This is called a reclist, meaning recording list or recite list. (録音リスト in Japanese) These collections of recordings are referred to as a voice library, or a voicebank. These libraries are referred to as "sound sources" (音源 (ongen)) in Japanese.

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There are many different types of reclists. Each reclist type has its own name. These reclist types generally are available for more than just 1 language.

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CV (単独音 (tandokuon)) | Diphone recordings

Stands for "Consonant Vowel"

A short reclist that produces a choppy, slightly robotic sound but can be remedied

with a good oto.ini file. Best for beginner users.

Example: わたし

[わ] [た] [し]

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VCV (連続音 (renzokuon)) | Triphone recordings

Stands for "Vowel Consonant Vowel"

Much longer than CV, this reclist provides every single transition note from every

possible phoneme/syllable in any given language. Best for experienced users.

Example: わたし

[- わ] [a た] [a し]

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CVVC | Diphone recordings

Stands for "Consonant Vowel - Vowel Consonant"

A reclist that provides CV and VC recordings to maintain a realistic, VCV-like sound while being a smaller list than VCV. This allows one vowel to naturally transition into the next without the need of extra VCV recordings.

Example: わたし

[わ] [a t] [た] [a sh] [し]