kokone (心響) is a new Japanese VOCALOID developed by Internet Co., Ltd., released on February 14, 2014 for the VOCALOID3 engine. Her name means “heart sound”. kokone is a VOCALOID designed to have a large vocal range. At the time of her release, her vocal range was the largest of any released VOCALOID. kokone is built to handle normal singing vocals, yet go high to sing falsetto without the change of range noticing. This allows her to act both as a main singer and as a backup singer to other vocals.