Vocaloid-Flex is a particular branch of the Vocaloid software which was designed for talking. It is more delicate to edit than the normal Vocaloid engine. It can be used in conjunction with software suits such as V-Talk. It differs from the normal engine, which focus is only on singing, it however works in the same manner of assembling phonetic data. Yet despite the fact it can now be commercially bought, much of the details of the engine are largely unknown. Its development was to extend the usage of the Vocaloid software making it fesiable to use the software for private licensing.
Ryuto and CV-4Cβ are the only two voicebanks known to use it. Further voicebanks using the software have not been confirmed.
The state of this software is unknown, though Vocaloid3 naturally has the capabilities to do talking more easily then Vocaloid2.