I'm working on a new realtime singing synthesizer able to sing in many different languages. For most voices other than Japense eSpeak voices are used, for Japanese one can use existing UTAU voicebanks, including VCV and multipitch voicebanks. I have prepared an example of eSpeak singing the C-Major scale: https://archive.org/details/DEFORUTO
To test the realtime synthesizer, which sould be able to run on a 600 MHz ARM-Processor I started building my UTAU Keyboard, which allows entering lyrics via a Pandora keyboard, similar to the Gakken NSX Pocket Miku and the VOCALOID Keyboard: https://archive.org/details/UTAUKEYBOARD
To test the realtime synthesizer, which sould be able to run on a 600 MHz ARM-Processor I started building my UTAU Keyboard, which allows entering lyrics via a Pandora keyboard, similar to the Gakken NSX Pocket Miku and the VOCALOID Keyboard: https://archive.org/details/UTAUKEYBOARD