Real time thread support is very mature in Darwin. Currently there is no audio stack peer on any platform that can compare with Apple's CoreAudio in terms of latency and audio chain generality.
BeOS and Haiku OS would give your latency claims a run for its money. The node based architecture allows piping and chaining as well. Disclaimer - I wrote a media (audio/video) editor for Haiku.
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Real time thread support is very mature in Darwin. Currently there is no audio stack peer on any platform that can compare with Apple's CoreAudio in terms of latency and audio chain generality.
BeOS and Haiku OS would give your latency claims a run for its money. The node based architecture allows piping and chaining as well. Disclaimer - I wrote a media (audio/video) editor for Haiku.