Ganv is a Gtk toolkit for connected boxes. Orig for audio patch visualization. I figger wth use it for Hal. see http://pastebin.com/zG8ApG2Z for src code. Runs on Ubu 12.04+ ( + is better newer bleeding edgier) Requires Ganv, Boost-dev ( meta pkg ) libgnomecanvassmm dev. Web links in src code. HTH Tomp tjtr33