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Whenever you digitize sound, it can happen that the sample data lies a bit
off the x-axis. The middle of the sample just ain't where it should be. On
the x-axis. This means that your sample contains an overall offset in its
data and should you apply effects to it, can drift away from the middle and
at some point become overdriven onesidedly.
(One half runs up (upper) or down (lower)). This operator prevents this from
ever happening again. (Though some of you will overdrive samples a lot at
some time, this ain't the cause anymore. It's your fault:)
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