If the Tonic Pad Player is not loud enough in Sunday Keys for Ableton Live, you might want to add the gain plugin on the whole Tonic rack and boost the volume as needed.
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