We develop our visual synthesizers using a graphical programming environment called the VMS Designer, which is integrated into the OVC-3D. Just as most audio musicians do not build their own synthesizers, many performers will prefer to play visual instruments created by other developers and will not need to use the programming tools. The VMS Designer has some similarities to audio synthesizer development tools like Pure Data in that the developer builds a synthesizer by using graphical tools to patch and configure modules selected from a library.