The Manager's highest OGG bit rate is 256Kb/s.
If you're prepared to put up with 500kbits/s audio files, though, you should be encoding to Flac not Vorbis. (Unless you have a device that supports Vorbis but not Flac -- Karma certainly supports both.)
My empeg (Rio Car) doesn't play FLAC files, and I don't want to have to keep duplicates of tracks in separate formats.
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-- Milo D. Cooper http://www.miloonline.net/