Where did I say that was an innovation?
And if it was an innovation at some point in time, I insist it was the year stereo was invented and the concept was just as invalid as a patent as it is today. Of course you expect the volume of your Left and Right channel to be controlled by the same volume knob.
This patent is like a car manufacturer patenting the idea of controlling all your direction with a single steering wheel, and all the other manufacturers are forced to implement individual steering wheels for each tire. It's just absurd.