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Cross Synthesis (クロス-シーサセス), often shortened in reference to "XSY", is a parameter that allows a voicebank to blend into another voicebank in a gradual and progressive way. It is only available with the full version of the software.

How to useEdit

First, the users must access the Cross-Synthesis Web browser through the Singer Editor, and can assign a Primary Voice and a Secondary Voice to be used in Cross-Synthesis. This feature works with a selection of VOCALOID3 voicebanks when imported into the VOCALOID4 engine, however not all products are compatable.[1]

A chart of the voicebank packages that support this feature is available on Yamaha's official website.

Cross-Synthesis will morph the Primary Voice using the Secondary Voice as an analytical data guide for the adaptation of the first. The cross-synthesis is not simply 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, in a way more complex than a simple fade out. The Primary Voice is used as a "template" for the morphing, it means the vocal combination used in the Cross-Synthesis is not mutually exclusive or interchangeable, thus meaning the rendering and behavior will be slightly different depending on which voicebank is used as primary or secondary voice.

  • Example: A Power-Normal setting will not be equal to Normal-Power.

Users can also choose how much the second voice impacts the first, from subtle to extreme. XSY is very similar in concept to how the original VOCALOID engine used recorded analytic data to adapt the VOCALOID engine noise to sound like the vocalist behind the data.

Note that some packages, such as the Megpoid V4 vocals, may come with their respective pairs already set up for XSY within the feature.

Benefits of XSY?Edit

When used effectively, XSY expands the capabilities of the VOCALOID package in use, increasing its overall abilities beyond what any single vocal within the package offers.

As seen in the Megpoid V4 package, XSY has the potential to create many different results. By mixing vocals with more extreme results, the combination of the two creates an effect that mimics having an entirely different voicebank. XSY mixes in traits of the other vocal to create an entirely new sound. By mixing a "whisper" type vocal with a "power" type, one can achieve a "power-whisper" result. A VOCALOID with just two vocals can achieve the equivalent of a third and fourth voicebank via the XSY function.[2]

While the result can be used throughout the entirety of a song, multiple XSYs creates a more realistic vocal performance. The vocal can go from a normal "whisper" to singing a high ballad to express a joyful happiness, made achievable by a "power-whisper" mix. In the same song, a "dark-whisper" mix can create a sad tone. In the case of the Megpoid V4 five pairs, they were intended to use XSY to allow the user to ease from one vocal to another, allowing for easier/smoother switching between the two vocals in each intended pairing.

For VOCALOIDs with access to even just one more additional vocal expansion library and XSY will see their overall tone capabilities doubled. This makes them a much more attractive package than VOCALOIDs with just a single voicebank.

From Ver.4.3.0 of the VOCALOID4 engine "groups" were added, which allowed for the first time a certain number of vocals to XSY between them that were never able to do so before. It allowed vocals to XSY between multiple characters.[3][4]

A benefit of this expanded function is that multiple characters can be used to support the main VOCALOID. For example, Megpoid V4's 10 voicebanks can be switched around to act as "tone controlling", adding a slightly different tone to another vocal depending on if the user wants their primary vocal to be altered. This is possible due to all 10 having the same vocal range and tempo. Others such as Kokone can be used to bring a vocal to a more "falsetto" tone of voice. Then there are vocals like Macne Nana which can be used to give a vocal support during faster songs, due to her stability during high tempos.

Voicebank XSY variants calculationsEdit

The following calculations give an estimate as to how many major shifts in tone a XSY capable voicebank can produce.

Note that "α" represents the number of vocals that have the option to XSY with the intended vocal being used - this includes its usage both as a primary and secondary vocal.

Equivalent potentially created additional vocals:

α x (α - 1) =

Theoretical total number of vocals is simply the previous result plus the original number of vocals thus the formula is:

α x (α - 1) + α =

For example, the Megpoid V4 release's 10 voicebanks work out as

10 x 9 = 90 additional possible results
10 x 9 + 10 = 100 total theoretical results

The following examples detail the results up to 15;

  • 2 voicebanks; produces 2 variations with XSY, 4 variations altogether including the original vocals
  • 3 voicebanks; produces 6 variations with XSY, 9 variations including the original vocals
  • 4 voicebanks; produces 12 variations with XSY, 16 variations including the original vocals
  • 5 voicebanks; produces 20 variations with XSY, 25 variations including the original vocals
  • 6 voicebanks; produces 30 variations with XSY, 36 variations including the original vocals
  • 7 voicebanks; produces 42 variations with XSY, 49 variations including the original vocals
  • 8 voicebanks; produces 56 variations with XSY, 64 variations including the original vocals
  • 9 voicebanks; produces 72 variations with XSY, 81 variations including the original vocals
  • 10 voicebanks; produces 90 variations with XSY, 100 variations including the original vocals
  • 11 voicebanks; produces 110 variations with XSY, 121 variations including the original vocals
  • 12 voicebanks; produces 132 variations with XSY, 144 variations including the original vocals
  • 13 voicebanks; produces 156 variations with XSY, 169 variations including the original vocals
  • 14 voicebanks; produces 182 variations with XSY, 196 variations including the original vocals
  • 15 voicebanks; produces 210 variations with XSY, 225 variations including the original vocals

Formula notes;

  1. It is worth noting that as XSY is a controllable variable, it is possible to create further variations than this chart displays by mixing more of one vocal with the other. For example, you may get a different result at 25% as opposed to 50% or 75% of the influence of the secondary vocal.
    1. However, the factors involved with how much you can get out of two vocals is dependent entirely on the two vocals involved. For example, two vocals which are relatively close in tone will give less varied results.
    2. These calculations are based on an "ideal setting" wherein the traits of both vocals are allowed to leak through enough to mimic the effect of having an entirely new voicebank. It does not factor in that more than one variable can be created; this is done so for simplicity sake.
  2. It is sometimes difficult to pinpoint the exact setting that gives the biggest difference.
  3. Note that the Vocaloid wikia's calculation will not take into account that some XSY compatible vocals are simply updates that add GWL, so some XSY combinations between older and newer versions of a software may show little response. However, the fact that GWL can change a vocal's tone when combined with other GWL compatible vocals is why they are taken as "different" XSY combination despite being the same vocal. This is why certain vocals such as Gackpoid V4 and V3 Gackpoid are still counted as producing different results.

XSY GroupsEdit

As mentioned above, Ver.4.3.0 of the VOCALOID4 engine added the "XSY group" assignments, extending the XSY usage beyond its previous capabilities. Certain XSY groups allow for vocals within them to XSY regardless of the character, while previously XSY had been restricted to one character only. This opened doors for very different vocal results from very different VOCALOIDs, with many even capable of producing a result that sounds like neither VOCALOID used in the process.

The same rules for XSY apply to this new group system, so nothing has changed except the potential number of vocals that are compatible.

Arranged by: Seller Tab / Group Name / Singer Name / Product Name

view • edit

LimitationsEdit

XSY is far from perfect. As with the "GWL" function, this feature may prove very limiting to vocals that are too similar. A common complaint with Megurine Luka V4X's English vocals "Straight" and "Soft" is how XSY barely impacts either vocal.

XSY can produce unpredictable or unexpected results when used. This is particularly true when the two vocals used for the feature have significant differences, or when the involved vocals were created without XSY in mind. This occurred with many of the VOCALOID3's voicebanks that gained XSY when they were imported into VOCALOID4.

  • Example: In the Megpoid V4 package, wherein while the respective pairs of vocals (Native and NativeFat for example) offer a moderate XSY result, XSY between the other 8 vocals offers more unpredictable results (Power and Sweet for example). Comparing also to the V3 Megpoid vocal, the V3 Megpoid vocals use of XSY is not so effective, as the voices were not originally intended for the function. The V3 Megpoid package produces considerably lower quality results when compared to V4.

Common FlawsEdit

Some common issues included;

  • Altered optimum range, either increased or decreased depending on the combination
  • Creation of new noises or the enhancement of known undesirable ones (such as mild "popping", "crunching/plucking", "static"), resulting in a loss of quality compared to the original two vocals that were used for it or the production of undesirable results. [5]
  • Tones that change unexpectedly as the vocal goes up and down the octaves (particularly of vocals with large vocal ranges and/or variation between the two vocals); this makes them unstable and even suffer from tonal collapse.
  • Causing vocals to produce a croaky result, a bug which does not impact all VOCALOIDs naturally (see BIG AL as an example of a VOCALOID with a known natural croakiness).

Why do Bugs appear?Edit

XSY's differences are worked out by use of mathematical equations, to work out the differences between the primary and secondary vocals and alter the wavelength of the primary vocal in accordance. The calculations don't work particularly well when the voicebanks have libraries built entirely different to each other as it was not designed to handle this and it is can be impossible to get good quality results.

This is why VOCALOID3 and VOCALOID4 XSY is not always feasible, nor XSY between languages and multiple VOCALOIDs. This is also why features such as E.V.E.C. may cause issues with XSY.

Below is a explanation for major known issues with XSY and why they occur.

Loss of Clarity;

For some vocals, they gain clarity because of a relied upon single or more trait such as a strong attack, powerful/clear tones or high quality recorded samples, traits which are common to "power" types. However, mixing these vocals with other very different traits can remove the very reason for their clarity.

"Soft" vocals have been known to impact clarity, due to their looser pronunciations, so mixing with this vocal can cause the sounds on the primary vocal to loosen and mimic the traits of the soft vocal. This can make the resulting primary vocal appear to mumble more as it weakens consonants which are often a clarity controller, allowing vowels to have more impact on the vocal.

This issue, appears when mixing different contrasting vocal types and is applicable to any vocaloid that can use XSY in any form as the already aforementioned Power/Soft XSY mix. It impacts the entire vocal XSY result. The issue is possible to fix both inside Vocaloid or in a sound editing software and is not too different to normal Vocaloid editing.

Exaggeration/noticeably of a flaw;

This can impact a small collection of sounds, tone or pitch.

One of the more common issues with XSY is how flaws are handled. If both vocals were drawn from the same set of (bad) data, or simply both ended up with a similar/same glitch (both in the case of vocals within a same release or different releases) then this trait is ignored by the XSY function. As a result, while other traits can be lessened as the vocal is adjusted to either vocal dominance the shared trait remains more untouched. Without having the other traits to hide it, the flaw becomes more noticeable even though nothing has changed it. This can be demonstrated in the Megurine Luka V4X English vocals "Straight" and "Soft", which share identical flaws as they draw their vocals from similar data.

On the other hand, if the flaw exists in the second vocal but is stronger a similar issue can occur. In this case, the other traits do not always has to be weakened in addition as the flaw itself is the impacted result. The second vocals impact makes the primary vocals flaw be pulled to match its strength resulting in the problem being made worst.

Both are a result of matching similar vocal types, but one that have contrasting results with each other, such as those made for single-character XSY.

Both cases are fixable if the user is familiar to both vocals, the one creating the problem or XSY pairing. It is often a quick or minor fix and requires tweaking on certain areas of the VSQX file. This can also be fixed with the right filters in an external sound editing software.

Glitches where there were none;

Sometimes, it is a simple case of a glitch exists in the secondary vocal, which when used for XSY, causes that glitch to appear in the primary vocal. Incorrect phonemes, unlinked sounds, and random crunches all can be added to a vocal that didn't have them before. This is also notable to occur between a V3 and V4 vocal such as the versions for Gackpoid or Megpoid. While the V4 version may have fixed the flaw XSY with a V3 version may re-add it back in.

Other times due to the extreme results of the secondary vocal, the result is a Lower quality sound overall with new glitches added altogether. This mainly appears when using cross-character XSY as it is uncertain what impact a second vocal like Cul Kokone or Gachpoid as these vocals tend to have great impact on other Vocals. The glitch is a flaw added by the XSY process itself.

These particular issues can be quite a problem for inexperienced producers and veterans alike. In both cases, it can go unnoticeable as it has already been noted some Producers fail to notice glitches in non-XSY results, especially if they are short or barely noticeable. It adds a poor quality sound to a result that otherwise would have been high quality. Often, since the Vocaloid software created the glitch, it must be edited within Vocaloid itself and cannot always be fixed by additional software.

Change of Range/Tempo

Each vocal has its own recommended range and tempo of which clearly marks where the Vocaloid results are best for each vocal. This is applicable even when the studio doesn't make the ranges known.

The two recommended ranges (vocal and temp) are determined by the layers of pitch per vocaloid both stationary and articulation based as a result of the combined samples of a voicebank library. XSY cross references both voicebanks layers of pitch sound to calculate a new result. A typical Vocaloid vocal in Japanese and English as 2-3 layers and the combined XSY result is then based on a 4-6 layer vocal instead. This can end up in both a good and bad impact on the sound when completed. The new voice has a new tempo and vocal range as a result that is different to the original two vocals ranges.

There are two things to note in regards to this;

  1. The new vocal result is strongest when the layers line up with each other overall with similar range, creating a solid foundation of which all layers support each other equally. This produces a HQ result, however, the downside is if the vocals are too close you may not see much of a difference
  2. A vocal which focuses souly on a single vocal range (example; lower octaves), can benefit when combined with a vocal that focuses souly on higher ranges or vice versa for the other way around. The new secondarily vocals addition layers offer addition extensive support, allowing the primarily vocal to go past its previous recommended range. However, this more likely is to cause previous mentioned glitches appearing due to the use of two very different vocals, causing a Vocaloid to produce LQ results.

An example of this would apply to VY1v4; "Power", "Soft" and "Normal" all can have this effect on each other, while "Natural" will have this effect on them. On the other hand, if you use "Natural" as the primarily vocal, then the other 3 vocals become support for it. They line up with all aspects of "Natural" and will strength and adjust certain aspects of the vocal, for example "Power" will strength its upper ranges while "soft" loosens them.

Software AgreementsEdit

Due to the licencing agreements between VOCALOIDs and studios, VOCALOIDs generally are not open for XSY between other VOCALOIDs or VOCALOIDs of other studios.


DemoEdit

Demonstrations

VOCALOID 4 新機能 「クロスシンセシス」 - Cross Synthesis - YouTube
Hiyama Kiyoteru Rock + Nekomura Iroha Soft SoundCloud
Yuzuki Yukari Jun + Tohoku Zunko Natural SoundCloud
Otomachi Una V4 Sugar + Megpoid V4 Sweet SoundCloud
Otomachi Una V4 Spicy + Megpoid V4 Power SoundCloud
Megpoid V4 Adult + Lily V3 SoundCloud
Gackpoid V4 Native + Gachapoid V3 SoundCloud
Tohoku Zunko Natural + Hiyama Kiyoteru Natural SoundCloud
Tohoku Zunko Natural + miki Natural SoundCloud
Tohoku Zunko Natural + Yuzuki Yukari Jun SoundCloud
Macne Nana Natural + Yuzuki Yukari Lin SoundCloud
Macne Nana Natural + Tohoku Zunko Natural SoundCloud
Macne Nana Petit + Nekomura Iroha Soft SoundCloud
Yumemi Nemu + Tone Rion V4 SoundCloud

ReferencesEdit

Please note we are waiting for more information on some languages

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