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Kotonoha Akane & Aoi
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This article is about the Synthesizer V Studio software known as a voice database. If you are looking for the Synthesizer V characters then click here.


On June 26, 2020, Kotonoha Akane & Aoi were announced to receive a shared singing library for Synthesizer V Studio.[1] In a press release held by AH-Software Co. Ltd. on the same day, their package was unveiled alongside Saki and the Synthesizer V Studio Pro editor. They were scheduled to release on July 30.[2] A special promotional campaign was held on AH-Software's online store until the end of September which offered up to half the price to those who own previous AH-Software products. Pre-orders for the Kotonoha package also began on June 26.[3]

Trial versions of the Kotonohas were released for the online Web Synthesizer V engine on July 22.[4] The full version of the Kotonohas released on July 30 as expected. They also received a "Lite" version of their voice database on September 24.[5][6] As of December 1, 2021, the Web version of the Kotonohas became non-functional as error messages were returned in spite of meeting minimum Chrome/Edge version requirements.

Voice Database Information[]


Web Synthesizer V[]

There were no demonstrations of Kotonoha Akaine & Aoi for Web Synthesizer V.

Synthesizer V Studio Standard[]


Synthtopia - Short version SoundCloud
泡沫のデザイア (Utakata no Desire) - Take 1 SoundCloud
泡沫のデザイア (Utakata no Desire) - Take 2 SoundCloud
Synthtopia - Full version Niconico YouTube bilibili
泡沫のデザイア (Utakata no Desire) - Full version Niconico YouTube

Voice Databases[]

Product Information
  Tempo: 70 ~ 180 BPM  Range: E3 ~ D5  Pitch Group: G#3, C#4, F#4, C5 (Falsetto)[7]

  Lite Version Available?: Yes  Starter Pack Available?: Yes  Web Version Available?: Defunct

Package details as noted:
Kotonoha Akane and Aoi are a pair of vocalists sharing a single young female voice database. Different parameters in the program are used to produce two different sounding voices. AH-Software noted that the voice database can be soft, yet strong, and can handle a variety of songs, supporting a wide range of genres.[8]

Software issues as noted:
  • Because the pair is using a single voice database instead of two distinct ones per character (for their VOICEROID and A.I. VOICE products, they have two separate speech voicebanks with distinguishable accents), it is nearly impossible to tell who is singing a song without a producer explicitly stating the name.
    • In addition to this, producers may interpret Akane and Aoi's voices differently to others' preferences.
  • As the Lite voice databases are generally restricted to monopitch (one pitch) only, the Kotonohas' range is noted to be Cs4 in this version.

System requirements as noted:

Hardware Requirements:

  • CPU: Intel Core i3 or higher
  • RAM: 2GB or higher
  • Disk Space: 1 GB or higher (for installing one voice database)
    • The amount of space required depends on the number of voice databases installed.
  • Display: 1280 x 800 or higher

Software Requirements:

  • Operating System:
    • Windows 10/8.1
    • Mac OS X: 10.11 or higher
    • Linux Ubuntu 16.4 or higher


  • DVD-ROM Drive (physical edition only)
  • Sound card
  • Internet connection is necessary for activation and obtaining updaters.

License agreements as noted:
  • AH-Software's End User License Agreement - Japanese
  • AH-Software's End User License Agreement - English
  • Regarding the Lite version:
    • AH-Software does not accept technical inquiries regarding free software nor do they guarantee or support the operation of all free software.
    • AH-Software is not liable for any damages (including loss of data) caused by using free software. Users are cautioned to use the free software at their own risk.
    • The program may not be transferred, sold, rented, distributed or rented without AH-Software's permission, regardless of whether it is paid or free of charge.
    • Reverse engineering, including modification, decompilation, and disassembly, of their program for any purpose is prohibited.
    • Kotonoha Akane & Aoi Lite may not be used commercially in any way
    • When using the Lite version of this voice database, "This work uses the Lite version" must be mentioned on any uploads.

Voice database sample