Logic Pro supports automatic assignment of hardware controls for a variety of USB MIDI controllers. When a supported USB MIDI controller is connected, the knobs, sliders, and other hardware controls on the controller are automatically assigned to Smart Controls and other functions in Logic Pro.
Buttons are assigned to button screen controls. Buttons for common transport functions (including Play, Stop, Pause, Record, Cycle and others), marker functions (including Previous Marker, Next Marker, and Add Marker), and other functions are assigned to the corresponding key commands for these functions.
Knobs are assigned to knob screen controls.
Faders are assigned to fader screen controls, with the following exception: when the controller has only one fader, labeled Volume, that fader is assigned to Mixer volume for the selected channel strip. For devices without knobs, faders may also be assigned to knob screen controls.
The first time you connect a supported USB MIDI controller, a dialog appears, asking if you want to use the device as a control surface.
To have Logic automatically assign the controls on the device to Smart Controls and other functions, click Auto Assign.
To use the device as a MIDI controller without automatic assignment, click No.
You can change the setting for each connected device in Logic Pro X > Control Surfaces > Preferences > MIDI Controllers. For more information, see Control Surfaces preferences and the Logic Pro Control Surfaces Support manual.