When you load a video into iMovie, the tools to edit the audio component, like reverb, are limited. I'd like to load a video in GarageBand, which has better audio editing tools than iMovie, but I don't know if the GarageBand sound editor will be able to pick up the audio component of that movie. Another way of asking, since I'm not wedded to either iMovie or garageband, is this: suppose you recorded yourself playing music on your phone. How would you edit the sound before uploading it to YouTube or some such? Thanks.