I can see the advantage of being able to do it if a band mate had a rig problem etc, but practically it seems like a lot of hassle trying to manage two rigs from one box, kind of like one of those 3 legged races where they tie two people together....
I’ve seen ax8’s going for like $900 or so. I think I’d rather have two guys both get an Ax8 and have their own controls etc, then trying to share one rig
In my band, I'm fortunate enough to be able to afford Fractal gear, but unfortuantely the other guitar player is not in a position to buy higher end gear. His gear doesn't sound as good as I would like, so I used my Axe FX II XL+ for both guitarists, controlled with my MFC-101. I used 5 scenes: Both Clean, One Clean/One Dirty, the Other Clean/Other Dirty, Both Dirty, and Dirty Rhythm/Solo Boost.
Since I am the lead guitarist and lead vocalist, it got to be quite annoying controlling both guitars while playing and singing, but it was doable. I eventually got an AX8, which the other guitarist now uses. This is a much simpler/better solution for me. If the scene selection was automated or if there was less busy (or more capable than I) person, it would totally work.
I think with the Axe FX III, if they made one or two changes, it would be doable, especially with the FC6/FC12 paradigm.
1. Four amps at the same time with 2 channels (rather than 2 amps w/ 4 channels), would work better for this
2. A virtual A/B/Y FX Block, allowing a MIDI command to switch between FX chains.
In this way, any player could switch between a clean and dirty amp, with all associated FX, independently of the other Player's FX chains and the FC series would be simple to implement for this kind of use.