http://line6.com/stagescape-m20d/features#touchscreenvisualmixing
Have a look at 'Touchscreen Visual Mixing' and 'Total Scene Recall'! A little crude for our purposes at the moment, but I feel the concept is quite sound and elegant, perhaps useful for late-stage mixing - who knows? In any case, I thought it was a very interesting idea that could in time be implemented for symphonic music; it made me think of a conductor's point of view - some things perhaps could be done more intuitively than in today's 'Arrange' and 'Mixer' pages...