Maybe I am wrong but doesn't the bottom signal path have to be connected from the input also?
Lastly, and i'm sure you already have done this but just to clarify. You will need to change the input to REAR instead of FRONT in the I/O settings of the axe-fx. Then just use Input 1 L/mono in the rear and Input 2 FX Return L/Mono for the other guitar.
Maybe I am wrong but doesn't the bottom signal path have to be connected from the input also?
Go in the "output" section and pan in there... I would think
Is Output 1 Mode set to "stereo"? Which inputs are you using?
stereo outs to stereo in into matrix amp and then to stereo speakers
How do u pan there...it doesnt have panning controls....thats why they use vol block pans I think
is the matrix in stereo mode?