I'm relatively new to OSX and was looking for simple but practical audio converter for converting my iTunes tracks to a specific bitrate in MP3 for use in my car. The trial of Switch did the job but I have now found this free software which is excellent - it covers all of the basics and works very quickly. I have read about a lot of people struggling to find a suitable audio converter on the Mac so wanted to share this for those who haven't used it before. I have nothing to do with this developer, just sharing a good app...
http://www.mediahuman.com/audio-converter/
http://www.mediahuman.com/audio-converter/