Hi, Have a play. Please. I know it might not be the most exciting app in the world, but feedback would be good. This is the first time I've written anything non-trivial in Linux. The spectrum analyser is back, now as a toggleable X window. Resizing to follow. One annoying bug - when the SA window pops up, it steals focus. If anyone knows how to create an unfocused window, preferably using only xlib, or something else ubiquitous, please please tell me. http://dis-dot-dat.net/code/sauditor/ James