Logic Pro X: Change track icons
By default, tracks use the same icon as the patch chosen for the track. You can change a track’s icon at any time.
Change the icon for a track
Do one of the following:
Control-click the icon in the track header, then choose a new icon from the shortcut menu.
Select the track, click the track icon in the Track inspector, then choose a new icon from the Icon pop-up menu.
Add a custom track icon
Control-click the icon in the track header, then choose Custom Icons from the shortcut menu.
Click the Add button (+).
Browse to the location of the image file and select the file.