This is an early vocal synthesizer design thing. It only includes the most basic things a synthesizer would have. This is a Japanese synthesizer because it does not understand the roman alphabet. It only understands Japanese hiragana and katakana. If you want a list of hiragana and katakana characters to copy+paste, check Wikipedia. If you want something with kanji characters, I recommend Nihongodera, as it can convert kanji to hiragana/katakana. This is my voice by the way. How does this work? This works by saving each hiragana and katakana character as a sound in the project. It will detect each one individually one-by-one and playing the corresponding one. Things I want to add: The rest of the sounds in Japanese I neglected. Changing pitch. Changing length. Cross-fading between notes. Remix this by re-recording each sound (keep the same name though!!) with your own voice!
