Once your arrangement becomes larger and larger, colors are good for keeping Logic Pro sessions organized. Instead of manually selecting regions to color them (hit ⌥+C for the Color Panel), automating this process is a timesaver. Here’s how.
Select Configure Track Header by pressing ⌥+T or by ctrl-clicking a Track Header.
Make sure ‘Track Color Bars‘ is checked. Now keep the track selected, but not the regions in it (click the grey area in the arrange window, somewhere where there’s no region). Press ⌥+C to bring up the Color Panel. Now pick a color. Note the colored bar in your Track Header, green in this example:
Any new region you record on this track will be green. Putting regions with a different color on this track requires you to re-color though. The key command for this is ⇧+⌥+C (the regions have to be selected) Now, once you have your colors set up, try this: Select one colored region, then press ⇧+C. Now all regions with the same color will be selected. Now you can Solo (press S), and then Bounce ⌘+B your entire drumset for instance. It’s a great way to make stems without having to worry about your routing.