I used to be able to make mp3/m4a files out of the audio from a video clip using either iMovie or Garageband (or a combination) but I haven't tried it in over a year, and I'm afraid I've forgotten how. Also, the programs have changed so much in that time that I'm not sure, even if I could remember how to do it, that I'd still be able. If anyone can explain to me how to do this using either or both of these programs I'd really appreciate it! Thanks. 