I recently bough Onyx Boox tablet. After degoogling device I'm really enjoy possibilities of android system more then closed one like Kindle or Kobo or Pocketbo

I recently bough Onyx Boox tablet. After degoogling device I'm really enjoy possibilities of android system more then closed one like Kindle or Kobo or Pocketbook. Main purpose is reading a lot of sheet music documents, making annotations and share with choir/orchestra. I discovered that Calibre is excellent tool for organisation of large database of sheet music documents. What surprised me most is how responsive drawing/writing by stylus is. Weird part is that apps need optimalisaton for fast responsivness which some apps have and some don't. Which mean eink technology capabilities are limited by SW quite significantly.