Ladspa Plugins Ladspa is a relatively new simple audio plugin architecture. This standard is open, and aims to enable linux audio applications to share audio plugins. GDAM has preliminary support for both loading ladspa plugins and creating them from mininetwork layouts. However, even with the packages, you will need ladspa.h to compile new plugins. Currently, the latest version is ladspapluginmaker-0.0e .
More packages are available on the download page .
Usually this will convert the xml to C code, then it runs the compiler. You can see it contains a bunch of nodes which are connected. You can drag them around, and drag pipes from inputs to outputs. When it is selected, a menu of adjustable parameters appears. This just adds all its inputs together.