A waveset is three zero-crossings:
Waveset Harmonic Distortion adds 'harmonics' of each waveset to the sound - for example, a second harmonic would be twice the frequency of the 'fundamental' waveset. The user is allowed to set each harmonic's volume - for example, whether the first harmonic is 50% of the fundamental, the second harmonic is 25% of the fundamental, etc.
This effect generally results in an increase of noise; we can see why Wishart called the waveset effects constructive distortion...
Number of
Harmonics: How many 'harmonics'
are to be added?
Harmonic's
gain: The relative gain from the
previous harmonic: eg 50% would mean that the second harmonic would
be 25% of the fundamental.