I am going away for a week and plan to take a guitar with me. No amp, however. I play clean with a little reverb. My thought was to get an adapter, plug the guitar right into the microphone input of my computer (a MacBook pro), open Garageband, and use one of the models in that. It isn't working. First question: Can I even do this? Two: if so, what am I doing wrong? If not, what is a cheap alternative? I may want to play with some friends, but mostly, I just want to practice while on vacation. I could just play unplugged, so that is certainly an option. But, this should be easy. Thanks for the help, and sorry for the dumbness factor of the question.