User`s guide

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Note that a power of 1.0 leaves the original sine wave unchanged.
Powers near 1 produce a subtle distortion effect. As the power goes
from 1 to 0, the sine wave changes to a square wave, with varying
amounts of “soft clipping” in between. Powers greater than 1 result
in pulse-like waveforms.
Specifying a negative power tells SFX Machine Pro to create a
unipolar signal (i.e., always positive, with a built-in DC offset). A
power of –1 yields what is known as a full-wave rectifier. For most
musically useful forms of audio distortion, you will want to specify a
positive power.
The following illustration shows the result of raising a sine wave to
various negative powers: