A connected and powered Mackie C4 unit will be detected automatically when you open Logic Pro. You can use the C4 in an independent control surface group (with other control surface icons placed above or below the C4 icon), or combined in a group with one or more control surfaces (such as the Mackie Control—place the icon to the right or left of the existing icons).
Although the C4 can be used independently, it is most useful when combined with other control surfaces, particularly the Mackie Control. In this scenario, the C4 adds eight channels in Mixer view. Using the C4 in its own control surface group allows you to edit instruments and effects independently, while performing mixing and other tasks on the Mackie Control or other control surface.