

Crypton advertised Luka's vocal database as "Japanese," like Kagamine Rin and Len's.Īt the time of Luka's release there was a growing interest in English speaking VOCALOIDs. The next day, Megurine Luka was officially revealed. On Januthe first letter of her surname was revealed with the promise of more information to come. This was revealed on the 14th of November 2008. However, a second voicebank was shown shortly before her release that gave her the capability to sing in English. The experience with producing the Kagamine Rin & Len act2, helped resolve many issues with the English vocal. The recording of the Japanese was noted to be constant, whereas with the English, the singer always sounded "angry" and everything took 4-5 times as much work, and English samples were cut at a length of more than 0.5 seconds. A further five sessions occurred, amounting 15/16 hours. Recording was resumed the following year in April of 2008. The voice of Luka was recorded in 4 hours sessions and took 5 days. According to Yu, due to the fact she needed to record in a single tone, she could not go out drinking the day before as it would make her voice bad. One of the words she was asked to record, being confirmed as "nerd" in various deliveries.

When they stopped laughing, Wataru Sasaki announced it was time to begin recording the English vocal. This made the five men in the recording booth break out in laughter. According to later reports, originally while they were waiting for the recording process to start, both Yu and a woman from marketing began to sing "Happy Birthday" in the style of Marilyn Monroe to John F. The first recording of Luka's voice was in December 2007. Originally CV02 (the Kagamine release) was set to be released at the end of 2007 with their final vocal CV03 (Luka's release) set to be released soon after after. The earliest reference to Luka's release was the existence of "CV03", which was listed on the Character Vocal Series webpage on August 10, 2007. She was intended to be the last of the CV series vocals. Her introduction was firstly by code (CV03) and her existence was made known during the Kagamine original release promotions. Due to reasons, the voicebank was delayed and the plans for "Hatsune Miku" changed, becoming a different Vocaloid entirely. Luka's provider was selected from a list of several candidates. The reason for a bilingual Japanese and English vocal was to break the restrictions set by katakana-English, which was noted for its tendency to sound off. Planning began in early 2007, and was devised immediately after Yamaha announced their VOCALOID2 engine, and a bilingual vocal which was originally going to be called "Hatsune Miku".
