audio - SoX: How to noise gate? -

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audacity has noise gate plugin works nicely. looking command line equivalent - unable figure out sox compand command it. tell me sox equivalent of audacity noise gate ? example, use in audacity "gate frequencies above: 0.0", level reduction: -12, gate threshold -48.0, attack/decay 250.0 ?

have tried using compand command in sox? see http://sox.sourceforge.net/sox.html, scroll down section compand command, , see says:

in next example, compand being used noise-gate when noise @  lower level signal: play infile compand .1,.2 −inf,−50.1,−inf,−50,−50 0 −90 .1

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