I just got my Mac and I'm really getting into GarageBand. I was just wondering if there are any sites that offer free loops and plugins for download? I plan buying some Jam Packs here soon. Which would you recommend? I'm considering the Symphonic Orchestra and Remix packs. Also is there a way to change the tempo of the song once you've started it? I see the option at the start of the project, but is it possible to change it midway through? Thanks!