start a new empty patch

and prepare a double patch:

set input 1 to "aux" (where you'll connect your ac. guitar) and input 2 to "guitar" (where you'll connect your electric g.)

put everything has to do with the el. guitar (amp + fx) on Path B, by default is already panned right

for your ac. guitar put everything on Path A (already pannned left)..

to keep a complete separation of the 2 paths do not put anything before the split point

for your acoustic sound don't use any amp model, much better the "vintage mic pre" fx

obviously your final HD output must be in stereo and you'll need both 2 output cables for L and R to go to the PA, if you want 2 separate channels and settings at the PA mixer board

also remember that the included tuner works only on input 1 and in case you need it for your el. guitar (input 2 above) you'll have to reverse the things written above..

anyway generally speaking much better to use an external piezo tuner