On June 11, Wat tweeted that Miku Dark's tuning was finishing up. On May 12, Wat tweeted that Miku Power was about 90% complete. In May, the webpage for Miku V4X was changed and it was revealed that she was releasing in the summer of 2016. On April 23, Wat reported that final checks of the Power voice were finished. Saki Fujita's voice produced good overtones. Wat tweeted that 'Original Power' had a different quality compared to the Kagamine Power voicebanks as it remained 'cute' and did not have the same tension caused by their power. On April 17, 'Solid Power' began production. On April 15, 'Solid Power''s existence was verified.

On March 2, 2016, Wat reported that news on Miku V4X would increase from this month onwards. It was also revealed that Miku's V4X would also contain 2 E.V.E.C vocals, Soft and Power, though more E.V.E.C. On August 31, it was officially confirmed that Miku's V4 update would be a V4X title and a demo was released showcasing a voicebank called 'Hatsune Miku Original'. On April 24, 2015, Wat tweeted about a VOCALOID4 update for Hatsune Miku and that it would have repaired phonemes to sound like her V2 voicebank and that other problems in her V3 would be fixed.

Vocaloid 4 miki