Crossfading between multiple matrices... and not just two.

I need to crossfade between multiple channels, which means crossfade between multiple matrices, and not just the 2 of the matrices in the jit.xfade does.. Simply put: I need like a mixer, where i can combine whatever 2 channels i want, and crossfade between these two, to be displayed in one window. I have really tried to harvest the forum for a solution and even the net for info, but i pretty much didnt get anywhere and i am quite stuck...

I was thinking of putting a preset between the channels and the jit.xfade but i came to the conclusion that didnt work quite well.
Check out the attached patch, its just a simple example, of where i am trying to go (i need to combine 1 and 2, 3 and 5 or vice versa, but all of these combinations to go into one fader). I need everything displayed/rendered in the pwindow.

Any suggestions?

Help is tremendously appreciated!!