It's probably better to compare it with Voiceroid, which focuses on plain TTS than singing. Here is one of the characters that is available in both Vocaloid an

It's probably better to compare it with Voiceroid, which focuses on plain TTS than singing. Here is one of the characters that is available in both Vocaloid and Voiceroid. https://www.ah-soft.com/voiceroid/yukari/index.html https://www.ah-soft.com/voiceroid/yukari/index.html You can see there are 6 tunables. The first three, "Speed", "Pitch", "Intonation intensity", seems pretty standard to TTS engines. For "Anger", "Sadness" and "Joyfulness" though, I think very few other engines provides settings to those. (Can anyone else name one?) The point is there is no one right way to speak a sentence. There is way more context than the text itself. Like the use of strange intonation in synthesized train announcements used in Japan to increate legibility in noisy environments, as another commenter mentioned.