About encoded audio
Applications like Windows Media Player, and Nokia Audio
Manager (included in the Nokia PC Suite) encode audio
files with codecs such as WMA or MP3 to save storage
space. The encoding is done by removing those parts of the
audio signal that are not audible or only barely audible by
human ear.
Regardless of the encoder and codec quality, the sound
quality of the resulting file is not as good as the original.
The basic codecs supported by this device are AAC, WMA,
and MP3. All of these have different variations.