Talk:Megurine Luka V4X/@comment-53539-20141030163954/@comment-53539-20141031165401

Meiko "Power" was not possible on the V2 engine, so a jump to newer engine can lead to new vocals appearing that were not possible due to the increase in capablities.

The guys at VO forums claim not a lot of things changed between engine, but most of it was centred around the new engines, but some details on phonetics improved. This is why V2 sound better in V3, basically the engine holds vocals together in a more stable way, allowing things that caused vocal collapse in V2 to have less of an impact in V3.