The signal, read as a line

One spine runs the whole length of the page: source at the top, master at the bottom, every processor a stop in between. Because the order on the rail is the render order, re-routing is just moving a stop up or down the line. Stops expand in place for their parameters, and the spine carries "+" insert points so you can drop an effect exactly between two others. Adding pulls in a slide-over catalogue grouped by category with a live filter.