I tend to agree, in a commercial sound control program like IzotopeRX one can set settings on a modal window while keeping the ability to control the main window. Also one can playback all previous states on the fly by clicking on a list of states, because it treats the process as a graph of Fourier states just like Gimp wants to create with GEGL. It is very important as a creator of a program with a complicated flow of tasks to let people feel that solutions are easy to accomplish. Now is Izotope easier as one imports only one track, but even Ardour in many ways is easier to handle than Audacity, and don't get me wrong, I love Audacity for what it does.