D.S. MP3 Converter is an easy to use and powerful audio converter produced by D.S Software Studio. it can change music file format among *.wav, *.mp3, *.wma, *.ogg, and etc. Built-in directory tree view make it easy to select source file. simply select the directory, all music files will be displayed on the right list pane. just check the audio files you want to convert and click Start! button, all work will be done. Best of all, it is completely freeware.