Apple Logic Express 9 - Manual (Page 793)

Linking Control Surfaces to the Mixer
Control surface groups follow changes in the Mixer, including changes to the Mixer view,
when the Link Control Surfaces setting is enabled in the Mixer.
To link control surfaces to the Mixer
µ
Open the View menu and choose Link Control Surfaces if it is not already selected (or use
the corresponding key command).
For details, see the Logic Express Control Surfaces Support manual.
793 Chapter 27 Mixing