OJOsoft M4A Converter - Version 2.7.1 OJOsoft M4A Converter provides a very easy way to convert M4A files to MP3, MP2, WMA, MP4(audio only), AAC, AC3, WAV, OGG. OJOsoft M4A Converter not only converts M4A files to audio formats , but also supports converting video and audio files to M4A, AAC, MP4(audio only).