When you install Apple Media Tool 2.1.1, QuickTime 2.5 is installed. The issue you are experiencing is related to an incompatibility with QuickTime 2.5 and the AMT Converter. In order to convert AIFF sound files into WAV sound files, remove QuickTime 2.5 and install QuickTime 2.1. When you do use the older version of QuickTime, you can successfully convert the sound files.
This article appeared in the 4 March 1997 issue of the Information Alley.