Industry veteran Brad Meyer has put up a tutorial on his site here explaining how to use one of the most indispensable tools in a sound designer’s arsenal. Creating a seamless loop. Stand back for blurb:
This is a simple trick I’ve used for years. It’s straightforward, but my designers and interns I’ve showed it to have appreciated it as a quick, easy, intuitive way to create seamless loops every time.
This method is useful mostly for static sounds at least a few seconds in length. It works great for ambiences, environmental effects like fire, wind, steam, water, or lasers, and even for sports sounds like skateboards, snowboards, and car engines at constant rpms.