On December 1st, 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 31st, 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 30th, 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:
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.
More triphones added.
Quality overall improved.
Vocals work better when used for XSY than the V3 Gackpoid package.
The complete product is one of two vocal package recommended to go with Fukase, the other being Sachiko.
As of Ver.4.3.0 of the VOCALOID4 engine, with the exception of the original galaco and Rana vocals (which are not counted as an official Internet co., Ltd release) all VOCALOID3 and VOCALOID4 Internet Co., Ltd. vocals can XSY between each other.
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.
This is particularly true more so when using the single voicebank releases from VOCALOID3 in XSY in either primarily or secondary roles. In addition to not being built with XSY in mind, they were never built with accompanying vocals in mind, so have no adjustments made to fit in with a accompanying voicebank of similar nature like the multi-bank releases did.
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.