Free MP3 Ringtone Converter is an effective audio tool to convert ac3 to mp3, m4a to amr, ogg to mp3 etc. You can use Free MP3 Ringtone Converter to convert all audios as mp3, amr, ogg, aac, ac3, m4a to mp3, amr, aac, ac3, m4a easily and quickly. So you can convert between your favorite audio to play on iPod, Zune etc popular audio player. It has the optimized default settings. Also, you can adjust the output effect by editing audio quality, sample, channel etc to meet your special needs. Release from the difficulties and limitations of audios.