Extension of Annotation Function in Collaborative Composition System

Due to the development of social media networks, there are now increasing opportunities for multiple people to collaboratively compose music using desktop music and digital audio workstation systems. To facilitate such efforts, we have been developing a system that supports creative, collaborative compositions, have analyzed the conditions required to support such efforts, and have proposed and implemented a collaborative composition system that satisfies these conditions. This system is an asynchronous groupware application with which communications among users are performed by exchanging character-based text comments. In this paper, we describe how we extended the comment function of this previous system to support handwritten annotations.