In this video, Nick teaches us how to use effects automation in Garageband. Any effects you use on your track will allow you to change the effects over time if you change how you want it. First, load up your track and loop it up by clicking on the loop button. Once finished, load up effects so you can automate them later. Hit the "i" button, then go to the details tab on the bottom. Now, change the effects you would like for automation. For the first one, go with the "au" filter, then for the second go with distortion. Close this, then play back the track by clicking on the triangle on the play bar. When finished, save and come back later to change if you prefer!