The Harden parameter is completely variable & can reduce a square wave to only one harmonic producing a Sine wave. The
Harden process can also be applied to the noise generator providing control over the harmonic content of the noise. Below is an
example of the “Harden” parameter on Pink Noise.
Finally there is Ring modulation. This uses two oscillators but instead of adding them together like in a mixer they are multiplied
together. This is very similar to FM & produces the kind of effect shown below:
The Ring Modulation effect creates metallic & bell like sounds & is used generally for lead sounds, but if used subtly can produce
Electric Pianos etc & if used radically can produce unusual sound effects.
All these methods further enhance the basic Oscillator waveforms to include many more or a useful mix of harmonics. Once the
waveforms have been selected you can then “fine tune” the harmonic content of the mixture of different waveforms by passing
them through a “Filter” to remove unwanted harmonics. The filter in an Analogue synthesiser is a very powerful “Tone Control”. Like
the tone control on a stereo, the filter can alter how things sound but it cannot change the style of music being played on the
record, & so the filter in a synthesiser can alter the “tone” of a sound but is restricted by the basic “Timbre” of the waveforms. For
this reason, several waveforms are available at once & you can “Mix” them together to provide more harmonically rich waveforms.
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