Charles Yeager at CGI Tuts+ explains how to change the render sound in After Effects. I can’t say I’d use a gunshot like he did… maybe a more beautiful sound like a kitten meow or a favorite song. Or, here’s an idea! How about a silent audio file so that you’re not suddenly startled by the render ending!
Anyway, Charles explains the process for both Mac and Windows.
We’ve posted about this before… here’s one from September 3, 2009: Custom render sounds in After Effects. If you’re running an older operating system and version of AE, take a look at this old tutorial.