Mackie Control Group button in Logic Pro

Press the GROUP button to activate group edit mode that allows you to edit various Mixer group parameters.

The upper row of the LCD displays channel strip names.
The lower row of the LCD displays group parameters.
The Assignment display shows the currently displayed group—G1, for example.
The Time display shows the group name. (If the name is longer than ten characters, the last ten characters are displayed.)
You can switch between group parameters with the V-Pot buttons.
The Cursor Up and Cursor Down buttons select the previous or next group.
The Cursor Left and Cursor Right buttons shift the group parameter display.
The SELECT buttons determine group membership. Pressing a SELECT button adds the channel strip to the group (or removes it from the group, if already a member). An illuminated SELECT button LED indicates active group membership.
The LED next to the GROUP button is illuminated.

Note: Make sure that the ZOOM button isn’t active when using the cursor buttons.

If Group Edit mode is off, holding down the GROUP button and pressing one or more SELECT buttons allows you to create a new group.

Pressing the GROUP button while holding down the SHIFT button creates a new group, opens the Group window, and activates group edit mode.

Pressing the GROUP button while holding down the TRACK button switches to Mixer view, with the channel strip group parameter shown. It displays the group that the selected channel strip belongs to. Multiple group membership is displayed as in the Mixer window. Rotating a V-Pot changes group membership.

Note: You can select only one group (or Off) with this function.

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Control Surfaces Support Guide for Logic Pro X

Mackie Control Group button in Logic Pro