This is a sound player specialized for listening study purpose.It plays sound files (mp3, m4a) synchronizing with text (audio script) on your screen.Easy to rewind / forward to the position you want to listen at by just tapping the script.This will help you study foreign languages more effectively.Prior to start this app, you need to prepare 1. Your sound files you want to play (mp3, m4a) 2. Script files with text Help will explain in more detail.