Sound design loops ABBA
You can also create seamless loops for backgrounds and ambiences. The editing is less precise than music editing, however the technique is a bit different, it’s not so much time based but more about how you edit.
There is a method called ABBA, no not like the sweedish group, but this is an edit method I’ve named after watching people edit this way.
In the below example there are crickets, if you play it continuously you may hear a click or pop or an awkward transition when the clip loops. What we do then is to take a given piece of audio and split it down the middle. The first part is the A and the second part is the B. We then put the B clip before the A clip and do a cross fade to which sounds seamless. Usually shorter crossfades work fine. When this clip loops around you are repeating at a point that is at the mid point of the audio.