Apple Loops Utility 3 - Manual (Page 22)

Function Keyboard shortcut
Decreases sensitivity.
Increases sensitivity five times.
shift
+
Decreases sensitivity five times.
shift
Nudges the selected marker by one pixel to the left.
Nudges the selected marker by one pixel to the right.
Selects the previous marker.
Selects the next marker.
22 Appendix Apple Loops Utility Keyboard Shortcuts