Daniel Pompougnac has released Lierre, a freeware mixer VST plug-in.
With Lierre you mix by using your mouse to activate or deactivate mixer channels.
In the top pink area all tracks are audible, but when you move your mouse over a pad of a specific track it will mute. In the bottom blue area all the tracks are muted, except those tracks where you move your mouse over the pad.
Visit Daniel Pompougnac‘s website for more information and a link to download Lierre.