Ah!  Got it!

Ok so you are essentially taking a mono signal out of your guitar, splitting it into two and processing the highs and lows into stereo by frequency instead of by pickup.
 
So could I do a similar thing with the two F1-x's I have in my bass rig when using for a non series bass and two cabs.  Take the input 2 of one F1-x into input 1 of the 2nd F1-x then follow through to two independent channels of my power amp to two speaker cabs?

I know this works for dual channel Fender amps and for the similar dual channel F-2B.  I would only be guessing as to whether jumpering works between two separate single channel preamps, like the F-1X.  I suspect it would, but I'm sure there is someone around here who could give more accurate advice in this area than me.  
 
Bill, tgo

If you are using two F-1Xs you could also connect the effects send of the first preamp to the input of the second preamp, run each to a separate side of your power amp then each side to a cabinet of your choice.

Bill, when I'm not running stereo, I plug into A, run a jumper out of the second input jack to a microverb, or holy grail, then plug that into channel B. All my stereo connections out the back stay the same....

Mike:
 
So you are playing with reverb on one side and dry on the other?
 
Bill, tgo