Can anyone tell me how to convert my m4a files into mp3? I am using an IMAC which is becoming a major problem in syncing with my Droid X. Additionally, I am using DoubleTwist and am finding several bugs. Does anyone recommend a different music player? B Tunes? I need to convert the files into mp3 as it appears that Droid X only can read mp3 files and can not read AAC files. Please help--quite frustrated.