This book is about the SuperCollider based Virtual Gamelan Graz and its musicological context. It is mainly intended for gamelan specialists interested in computational methods and music theory of Java. An article by Rainer Schütz and Julian Rohrhuber discusses the details of the realtime synthesis implementation in SuperCollider, which is a bit of a blend of javanese and sclang (Schütz/Rohrhuber/de Campo).