PWGL is a free cross-platform visual language based on Common Lisp, CLOS and OpenGL, specialized in computer aided composition and sound synthesis.
http://www2.siba.fi/PWGL/index.html
Take a look at the ENP page, it provides access to its notational data structures, and it can be controlled algorithmically. http://www2.siba.fi/PWGL/enp.html


















