MainStage: Screen controls in performance
In performance, you use the controls on your MIDI hardware devices that are assigned to screen controls to manipulate the parameters mapped to those screen controls. When you select a new patch, the parameters you mapped for that patch are instantly available for editing.
When you move a physical control, the screen control updates based on the Respond to Hardware Move parameter in the Screen Control Inspector. If the parameter is set to Jump, the screen control instantly moves to the position of the hardware control. If the parameter is set to Pickup, the screen control starts moving when the hardware control reaches its current position. If the parameter is set to Relative, the screen control moves in sync with the hardware control, starting from its current position.