- What software exists for each of these formats?

If you are asking about non Plan9 software I'd start with
ffmpeg.

- Which format is the most "popular"?
I don't think I understand the question.

Sorry, let me rephrase:
  - Of the different audio driver interface designs
    (audio(3), usb(4) and inferno usb(3)) which software
    (p9 and limbo) uses each?
  - Which of these interfaces is used the most?

Roman.

Tim Newsham
http://www.thenewsh.com/~newsham/

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