If you get an error message saying "Some plugins may cause feedback, do you want to turn Feedback Protection On?" you can go ahead and say no or disable Feedback Protection when using Sunday Guitar.
Sunday Keys Version 2
Using the Tonic Pad Player
Getting Started with Sunday Keys for MainStage
Troubleshooting Sunday Keys for Ableton
What Gear do I need?
Troubleshooting Sunday Guitar
My Song-Specific Patch is Different from the Demo
Customizing Your Song-Specific Patch
My instrument/controller isn't connecting