On December 1, 2014, when asked about VOCALOID4 updates, Noboru responded that they wished to update all of their VOCALOID3s to the new engine but had no specific schedule at the time.
On March 31, 2015, Gackpo was announced to have a VOCALOID4 update. This update contains his 3 voicebanks from the VOCALOID3 engine, but with added growl samples. It was confirmed that he would be released on April 30, 2015.
Gackpoid V4 software is an update of the VOCALOID3Gackpoid with added growl samples. It includes the following voicebanks: "Native", "Whisper" and "Power". Vocals can be purchased separately or as a complete package.
The package also contains demo song data and illustrations.
Vocal traits as noted:
More triphones added.
Quality overall improved.
The complete product is one of two vocal package recommended to go with Fukase, the other being Sachiko.
VOCALOID4's parameter XSY can be used on all 3 voicebanks within this package, as well as GWL.
In total the package offers the equivalent of 6 additional voicebanks achievable via XSY. The total tone variation offered by the package comes to a theoretical 9 voicebanks in total.
From Ver.4.3.0 of the Vocaloid engine, a XSY group "Internet" was added to Vocaloid. All vocals within the "Internet" group can XSY with each other. This vocal release is part of this group. If a User owns one or more vocals within the "Internet" group, XSY between them will open up as a result of owning this release.
The "Internet" group is currently the largest XSY group. In total if user was to own every VOCALOID3 and VOCALOID4 XSY capable INTERNET co., LTD vocal, this offers the equivalent of 812 additional voicebanks achievable via XSY. The total tone variation offered by the combined packages comes to a theoretical 841 voicebanks in total.
Note that Users of the updated XSY list have to understand that as confirmed by Internet co., Ltd themselves, depending on the combination of the two vocals a level of extra unwanted noise may be generated.
Another note worthy detail on V4 and later vocals compared to V3 vocals within this group is that Internet Co., Ltd. increased the number of triphones from Chika onwards. Thus, many newer vocals do not match sound-for-sound with the older pre-Chika released vocals.
Post VOCALOID4 releases were also developed with XSY in mind, so are better for XSY then the older VOCALOID3 releases.
In addition to not being built with XSY in mind, VOCALOID3 packages with only 1 vocal in their contents that were releaseddmay be even more problematic for XSY. Internet co often made multi-pack releases have a quality that made switching mid-song less noticeable, making them slightly better for XSY then single vocal releases.
Note that also "GWL" does not become viable for use with any V3 vocals used as the primarily vocal. This should be considered when using any vocal for XSY within the "Internet" group from V3.
Software issues as noted:
Aside from GWL and a slight improvement in quality, this package offers nothing the previous V3 Gackpoid package didn't already offer. The reason for this is because no new recordings were done and the package was created by improving the old VOCALOID3 samples.