Using The Versatility Of The KN7000

One thing that comes to mind that does not often seem to get aired are the outputs of the 7000 I.E line in/line out/sub out Etc. The permutations must make this area of the 7000 very versatile indeed.
It struck me that having three active speaker/combos I was not using this facility to it's full potential so I wondered if anybody has experimented with it and come up with an ideal setting or some interesting settings