ACWELCH I used an older version of this about a year ago to convert some old System 7 files to use with Eudora. I downloaded this updater to convert w4a files to mp3. I had no problem at all converting these files. One m4a file had a problem with encoding. A window popped up to alert me that the file, as it was, could not be converted. I clicked on the "Trouble Shooting" button, followed the suggestion on the webpage, and the file was converted without a hitch. This is a very useful application for a great price. I haven't used SoX Wrap, but perhaps both would be useful utilities.
OS X 10.4.2; G5 1.6 GHz
(Version 051029)