I see that the PDF version of the docs includes the samplerate conversion settings information that was missing from their HTML version of the docs. So the root of the problem is that the HTML version of their doc page has some kind of a malfunction where it is dropping text.

Proof: Search for the following text:
Code:
24-bit mastering

Search in each of these pages:
http://sox.sourceforge.net/sox.html
http://sox.sourceforge.net/sox.pdf

Note that the text only appears in the latter page.

But even with the PDF version, I still can't find anything on how to control the MP3 encoding bitrate or quality level. Can you find it in the man page?
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Tony Fabris