Audio-only FLV
Despite working with it for years, today learned something new: 1) FLV can be used in an audio only mode 2) FLV can support ADPCM, uncompressed, NellyMoser and of course Mp3, that flash can load dynamically. While most aren't that common, there are times when it's better. For one, Mp3 licensing can be expensive.
http://en.wikipedia.org/wiki/Flash_Video
Maybe even output PCM samples from dynamic sound generation?
http://www.flashbrighton.org/wordpress/?p=9