Full list of MIDI Learn actions:

Switch presets
Mute and unmute, solo and un-solo apps and Audio Units
Adjust gain, pan and effect dry/wet: continuously, by direct assignment of a particular value, or a nudge up and down by a particular value
Toggle effect bypass
Toggle session play/pause
Adjust session tempo
Adjust Audio Unit parameters
Switch to apps and Audio Units
Toggle play/pause for apps
Trigger any Connection Panel button
Trigger any Audiobus Remote button (an expanded set of third-party app functionality)
Switch Audio Unit factory presets
Send MIDI messages to Audio Units (PCs, CCs or Notes)
Available now

https://audiob.us/download
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Live: Casio PX-560, Roland VR-700
Home: Rebuilt 1910 Chickering 5'2", Fender Rhodes MKI 88k, Yamaha S90ES