Free Audio Converter CS - Version 1.0.0 Free Audio Converter CS is a audio encoder and converter for various formats. It can produce MP3, MP4/M4A, Ogg Vorbis, AAC, Bonk and FLAC files. Free Audio Converter CS makes it easy to convert your audio CDs to MP3 or Ogg Vorbis files which you can use in your hardware player or with your favorite audio software.