I have a really small hard drive on my macbook pro and after installing two garage band jam packs, my hard drive is almost full. I found the folders where the jam packs and garage band audio files were and I copied them to an external drive. This is all great but now when I start Garageband, the program does not have any loops and does not have any jam packs installed. How do I tell Garageband to look for the audio files on my external hard drive? Or how do I relink my audio files to garageband?