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Wowza Audio-Only & JW6
Wowza has an audio-only stream it can create on the fly:
http://www.wowza.com/forums/content.php?208-Adding-Multi-bitrate-Audio-only-Rendition-to-iOS-Streams-(AppStore-64Kbps
And this is showing in the HD quality menu as 0kbps. When selected, it continues to show the lowest bitrate.