[Vorbis] oggenc adds severe distortion

[Aoyumi]

> I've used xmms and Winamp regularly and this is the first time I
> noticed these problems.  Curiously, they work fine with the WAV
> and flac versions of this album.  Something about the way they handle
> vorbis files?  I dunno...

The Dither function of Winamp is easy to cause the issue of clipping. If 
this function became ON, you had better turn it OFF.

Aoyumi