[sldev] Wind Sound CPU usage. (patch-4)

[Jason Giglio]

Here's a new patch that combines techniques from Aimee's patch and my 
original patch.

It does frequency damping conditionally based on whether it needs to or 
not. That is, if the frequency isn't changing (much), we don't need to 
damp.  This addresses the very subtle pop that Aimee observed when you 
suddenly stop moving.

This newest patch profiles at 1.1% standing still, 1.3% moving, and near 
0% when wind is muted or turned way down.

-Jason

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