Each is sold as 'a singer in a box' designed to act as a replacement for an actual singer. Various voice banks have been released for use with the Vocaloid synthesizer technology. The software can change the stress of the pronunciations, add effects such as vibrato, or change the dynamics and tone of the voice. A piano roll type interface is used to input the melody and the lyrics can be entered on each note. To create a song, the user must input the melody and lyrics.

It uses synthesizing technology with specially recorded vocals of voice actors or singers. The software enables users to synthesize 'singing' by typing in lyrics and melody and also 'speech' by typing in the script of the required words. Backed by the Yamaha Corporation, it developed the software into the commercial product 'Vocaloid' that was released in 2004. Its signal processing part was developed through a joint research project led by Kenmochi Hideki at the Pompeu Fabra University in Barcelona, Spain, in 2000 and was not originally intended to be a full commercial project. Vocaloid ( ボーカロイド, Bōkaroido) is a singing voice synthesizer software product. Japanese, English, Korean, Spanish, Chinese, Catalan

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