Hi there, I'm a graphics guy, and by no means an audio guy, but I come here to seek some help. I'm looking to create some 10-15 second high energy audio clips for some sports type motion graphics. Nothing very specific, just some thing exciting that will be cool to give my animations some energy and something to edit to. I have Garageband '08 and Soundtrack pro. In either of these apps, is there some way I can easily create something that I designate to be 15 second and have a beginning and end? Thanks!