It’s a full-featured companion app that lets you convert audio files to a number of different formats. It provides full support for conversion between various lossless and lossy music file formats, namely:

Supported target formats:
FLAC
M4A
M4B
MP3
MP4
Ogg Vorbis
WavPack
wave
WMA

Supported source formats:
AAC
FLAC
M4A
M4B
Monkey Audio (APE)
MP3
MP4
MPEG+/MPC
Ogg Vorbis
WavPack
wave
WMA