■ What is UTAU?

　　 UTAU is a vocal synthesizer software developed by Ayame/Ameya in 2008. UTAU is very popular because it is free to get and you can create your own UTAU voicebank. There are many tutorials on search media.

■ What is Wavetoone?

　　Wavetoone is a virtual robot singer group that was initially developed alone by Rawa. Slowly developing to add new voicebanks and characters. The plan is for this group to be a sound experimentation laboratory, where all prototypes will likely be made public.