Menestrello is the perfect app for reading+listening EPUB 3 Audio-eBooks. Menestrello is the official build of Minstrel (. It/minstrel/), the FLOSS hybrid reading app. Menestrello is designed for EPUB 3 Audio-eBooks, that is, reflowable text and embedded, synchronized audio. Other formats (EPUB 2, EPUB 3 FXL, etc. ) that can be loaded in the app are not officially supported.