only way I've done it as above, amp sim, panned left, and drop an amp into the right path, then turn it off... gets you a nice pass thru clean signal, panned right.. then on the back left out goes to amp/speaker/usb interface, whatever you wish to use...., right out goes into your amp to use it as a normal clean guitar into amp setup....
oh and the input needs to be set as guitar/guitar, otherwise left and right won't work correctly...(IE no sound from the right channel cause the right will be looking at a different input then guitar) same doesn't even net the right result.. gotta be guitar/guitar