For example, you could lock a control surface to control the Main Mixer, so you can always control overall levels while playing/tweaking other devices. See “Remote controlling the Main Mixer” for an example.
Control surfaces/keyboards that use the Easy MIDI Inputs function (see “Automatic set-up using the Easy MIDI Inputs function”) cannot be locked to devices.
If the selected control surface supports keyboard shortcuts for selecting mapping variations (see “About mapping variations”) an additional “Always use Mapping” pop-up appears.The device is now locked to the selected control surface. In Remote Override Edit mode (see “Activating Remote Override Edit mode”) a locked device is shown with a lock symbol in the upper left corner of the device panel.
It’s also possible to lock a control surface to the ReGroove Mixer (see “The ReGroove Mixer”) to control its parameters via Remote!