Phrase-by-phrase player with parallel texts

Hi! I'm working on phrasal player with parallel texts, for language learning materials. It's also editor, hosting, and collaborating tool for that kind of materials. It's like made subtitles online. But mostly for audio materials: books, acapellas, poetry. And language learning oriented. What do you think about the idea in general? https://frazy.me/material/UAFvcWZLjJT1rzIDR8Ak/en