This function will smooth the undulation a sound wave. This is usefull for LP recordings or other pops/clicks. The amplitude is smoothed, which means that high frequent parts are filtered out. So basically this function will perform a kind of low-pass filtering. It won’t cut-off frequencies above a special limit, but it will lower the volume according to its frequency. The higher the frequency, the more it get filtered.
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This function can also be of help in removing pops and clicks. Just call this function as often as needed for the same range, but better keep the used range as small as possible.