Cross-Synthesis

Cross-Synthesis (クロス-シーサセス). abbreviated as XSY, is a function in the VOCALOID4 engine. This function is not available in previous engines and is a major software improvement over the VOCALOID3 engine.

Function
Cross-Synthesis is a timbre-altering function that allows users of the VOCALOID4 engine to combine (or "cross") two VOCALOID3 or VOCALOID4 voicebanks. Cross-Synthesis does not work with VOCALOID2 voicebanks due to different recording techniques. Users access the Cross-Synthesis Web browser through the singer editor, and can assign a Primary Voice and a Secondary Voice for Cross-Synthesis. Please note the cross-synthesis is not switching between two voices as the users draws a parameter curve, but is instead increasing the ratio of the Secondary Voice being combined with the Primary Voice. Cross-Synthesis was implemented as a way to truly combine and utilize multi-voice VOCALOID voicebanks (such as Miku V3 or Galaco NEO). Cross-Synthesis will morph the Primary Voice using the Secondary Voice as a guide. The higher the XSY is set, the more morphed ("crossed") the Primary Voice will become. Please note that two voicebanks are not mutually exclusive. For instance, "Miku V3 Solid/Miku V3 Vivid" will sound different than "Miku V3 Vivid/Miku V3 Solid", depending on which voices are assigned the Primary and Secondary voice roles.

Cross-Synthesis Groups
Not all VOCALOID voicebanks can be cross-synthesized with each other. VOCALOID4 is hardcoded to recognize which VOCALOIDs can be cross-synthesized with each other, and organizes them into Cross-Synthesis Groups. These groups are changed and expanded upon as VOCALOID4 is updated, adding more groups as more VOCALOIDs become available. An example of this is that Lily V3 was not able to be cross-synthesized with Lily Native by users of the beta version of VOCALOID4 until an update made it possible.

A list of cross-synthesis groups are as follows: VOCALOIDs that can not be cross-synthesized are as follows: