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Kaai Yuki VOCALOID2 VOCALOID4 | Songs Albums Notable Originals

This article is about the VOCALOID4 software known as a voicebank. If you are looking for the VOCALOID character then click here.


Silhouettes of the AH-Software Co. Ltd. VOCALOIDs were revealed on a poster on November 6, 2014, however, it was unconfirmed what they were for at the time.[1] On November 20, it was confirmed in the VOCALOID4 debut livestream that they all, with the exception of Tohoku Zunko, would receive VOCALOID4 voicebanks.

It was later confirmed that due to Yuki's original voice provider maturing, possible growl samples would be recorded from a new voice provider.[2]

On August 17, 2015, it was noted that Yuki and Hiyama Kiyoteru would receive demos some time after the concert ends in Vienna, Austria.[3]

On September 30, Yuki was confirmed to only receive a Natural voicebank. This could be purchased on its own or in a starter package. Her release date was announced to be October 29, 2015.[4]

On October 15, a trial version of her VOCALOID4 voicebank became available.[5]

AH-Software later mentioned at an event that Yuki could not receive XSY vocals until her provider turned 20.[6]

Product Information[]



妬心 (Toshin) (Short ver.) SoundCloud
妬心 (Toshin) (Full ver.) NicoNico YouTube SoundCloud
週末神主★祝詞ガール (Shuumatsu Kannushi★Norito Girl) (Short ver.) SoundCloud
週末神主★祝詞ガール (Shuumatsu Kannushi★Norito Girl) (Full ver.) NicoNico YouTube SoundCloud

System Requirements[]

  • OS:
    • Windows: Windows 10, Windows 8.1, Windows 8, Windows 7 (32/64bit)
    • Mac: Mac OS X 10.9, 10.8 (32/64bit)
  • CPU: Intel Dual Core CPU
  • RAM: 2GB or more
  • Hard Disk Capacity:
    • Natural:
      • More than 1.5GB (using VOCALOID4 Editor)
      • More than 9.4GB (using VOCALOID4 Editor for Cubase + Cubase)
    • Starter Pack:
      • More than 2.5GB (using VOCALOID4 Editor)
  • Internet connection.


Product Information
  Optimum Range: F2 ~ C4[7]  Optimum Tempo: 50 ~ 150 BPM
  Total Tempo (min-max): 100 BPM  No. of Keys: W ~ 12, B ~ 8, Total ~ 20
  Trial/Demo Vers?: Yes  Starter Available?: Yes  App vers.?: Yes
Package details as noted:

NATURAL is an update from VOCALOID2 Kaai Yuki. Being voiced at her time by a young child that nowadays has a different voice because of her age, certain recordings of missing phonetic data and growl were recorded by a new provider, though this doesn't have a noticeable impact on the overall sound of the vocal.

Vocal traits as noted:
  • GWL capable
  • Maintains the original traits of the V2 voicebank with smoother transitions.
  • The particular raspiness of the vocal was reduced to produce a more natural whispery tone.
  • While the timbre of the voice maintains the same, the power of low and high ranges have been slightly increased to produce a less muffled and loose performance.
Phonetic notes as noted:
  • Triphones added.
  • Phonemes were cleaned and fixed, increasing her clarity, specially on higher notes.
Software issues as noted:
  • Apart from the addition of triphones and growl, this package does not offer any other noticeable vocal improvements.
  • When AH-Software opened up their vocals to full XSY between their entire catalog of VOCALOID3 and VOCALOID4 vocals, Yuki was not included and is the only one that cannot XSY with another AH-Software vocal.
Voicebank sample

Kaai Yuki V4 Natural