Adjust an automation point range in Logic Pro for Mac
You can adjust the automation data for an entire track in one go. If the track is part of a group, and if the relevant settings are selected in the Group Settings window, the track automation data across all tracks in the group adjusts accordingly. However, the relative parameter values of each track are maintained.
You use the trim behavior in the track header to adjust automation points for an entire track or for multiple selected tracks that show the same parameter in the Automation Parameter pop-up menu.
Adjust a range of automation points
With Logic Pro in automation mode, after making your selection, place the pointer over the numerical display in the track header (the parameter value changes to Trim), then drag vertically to change the value (the offset or trim amount).
When you adjust a range of automation points, the relative differences in their values are retained. If the value of any of the automation points reaches the minimum or maximum value, none of the values can be adjusted further. You can override this behavior by holding the Option key while dragging.
Tip: If the Trim field is not visible, position the pointer over the line dividing the track headers from the left edge of the tracks, then (when you see the Resize pointer) drag the line left or right to resize the track headers.
When you release the mouse button, the numerical display reverts to showing the value of the active automation parameter at the playhead position.