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Nekomura Iroha V4

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This is an article about the Nekomura Iroha software for the VOCALOID4 engine.


Silhouettes for Nekomura Iroha, along with the other VOCALOIDs by AHS, were revealed on a poster on November 6, 2014, however, at the time, it was unconfirmed what they were for.[1] On November 20, it was confirmed in the livestream for VOCALOID4 that they all, with the exception of Tohoku Zunko, will be receiving VOCALOID4 voicebanks.  

On April 25, 2015, another Iroha design was revealed at the Nico Nico Choukaigi event but it was unknown what the design was for.[2]

On May 14, AH-Software confirmed that Iroha would have a Natural and a Soft voicebank, which allows her to use Cross synthesis and she would release on June 18, 2015. It was also revealed that the design shown in April was for her Soft voicebank. Iroha's Natural and Soft voicebanks would be available for purchase individually or together, and a starter pack version would also be offered. Other details such as tempo, range, the prices for her packages were also revealed. It was also shown that Iroha V4 has two official MMD models by ISAO.[3]

On June 4, trial versions for Iroha's Natural and Soft voicebanks were made available.[4]


Iroha's VOCALOID4 package is supported by exVoice samples.

Product InformationEdit



機械仕掛けの歌姫 (Kikai Shikake no Utahime) (Natural/Soft) Niconico SoundCloud
フルパワー!まじかるぼいすっ! (Full Power! Magical Voice!) (Natural) Niconico SoundCloud
お前という名の物語は泪で汚れちまってる (Omae to iu Na no Monogatari wa Namida de Yogore Chimatteru) Niconico


  • OS:
    • Windows: 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)
    • Soft:
      • More than 2.5GB (using VOCALOID4 Editor)
      • More than 10.3GB (using VOCALOID4 Editor for Cubase + Cubase)
    • Starter Pack: More than 2.5GB (using VOCALOID4 Editor)
  • Internet connection.

Voicebank LibrariesEdit

Product Information
Package details
This is the new version of Iroha. It's a professional voicebank intended to be a direct recreation of her voice provider's vocals. This replaces the old version of the package with a updated version plus an additional voice for XSY.
Vocal traits as noted:
  • XSY possible between "Soft" and "Natural"
    • In total the package offers the equivalent of 2 additional voicebanks achievable via XSY. The total tone variation offered by the package comes to a theoretical 4 voicebanks in total.
    • As of Ver.4.3.0 of the VOCALOID4 engine, AH-Software Co. Ltd. have opened up XSY to work with all their VOCALOID3 and VOCALOID4 vocals except Kaai Yuki V4, so if a User owns another of their vocals XSY between them will open up.[5][6]
    • In total if user was to own every VOCALOID3 and VOCALOID4 Ah software vocal, this offers the equivalent of 156 additional voicebanks achievable via XSY. The total tone variation offered by the combined packages comes to a theoretical 169 voicebanks in total.

  • GWL capable
  • General phonetic quality improved

Individual VocalsEdit

Product Information
  Tempo: 70 - 170bpm  Range: E2 ~ G4
Package details
Iroha's "NATURAL" voicebank is a direct update of the original VOCALOID2 vocal and is intended to have a natural sounding tone.
Vocal traits as noted:
  • Maintains the original VOCALOID2 qualities: "powerful" tones and a clean, clear voice.
  • Triphones added.
  • Can use GWL.
  • Compared to "Soft", it can handle faster genres of music much easier.
  • It has a larger tempo range than "Soft" and can handle more genres of music.
Software issues as noted:
  • A complaint related to this voice is that it does not always sound like the original VOCALOID2 version because she was fully recorded.
Voicebank sample

Iroha Nekomura VOCALOID4 Natural

Iroha Natural Sample

Product Information
  Tempo: 50 - 130bpm  Range: F2 ~ F♭4
Package details
Iroha's "SOFT" voicebank is a softer version of the Iroha voice.
Vocal traits as noted:
  • Tackles the main issue with the original Iroha voice of being too solid for some genres of music.
  • Is intended to be more expressive than the original vocal and has a much breathier, loose but realistic texture.
  • Handles slower songs better than the "Natural" voicebank.
  • Like "Natural", this voice is clear and clean sounding.
  • Much more feminine sounding compared to the original voice.
Software issues as noted:
  • It has a smaller tempo range than "Natural".
  • The voicebank is more breathy and raspy than soft but it allows her to work well in softer music compared to Iroha V2 + BRE.
Voicebank sample

Iroha Nekomura VOCALOID4 Soft

Iroha Soft Sample


  2. New Iroha design
  3. link
  4. Trial versions
  5. link
  6. link


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