By "zero" do you mean zero-crossing? There are several functions to search for these (find-zero in extsnd.html for example) -- you could use the crossing locations to set the limits on (scale-by 0.0 ...). If you're looking for sections without any real signal, perhaps map-silence in extsnd.html will help -- it detects portions that look like silence, then either squelches whatever hiss is there, or deletes that section altogether.
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