One of the big problems with MainStage for guitarists has always been a lack of live control. There's nothing worse than feeling like your software is disconnected or a barrier between what you're doing.
Sunday Guitar Version 2 for MainStage 3:
https://sundaysounds.com/sunday-guitar
Good news is that there's more live midi control options than ever before. I've become a huge fan of the Line 6 FBV3 foot controller. It has a very 'helix-y' vibe and is the perfect companion to our new Sunday Guitar 2 resource.
In this quick video you'll learn how to integrate the FBV3 in a live MainStage guitar rig!
Line 6 FBV3:
https://amzn.to/305gjTn