D. Waveform

In the early days of the synthesizer technique the vibrations has been produced by electronic circuits. The only waveforms that could be made with that had the form of a sine, square or saw tooth. Nowadays vibration waves can be calculated by computers and thus we can create an endless number of different waveforms with different symmetries. They all differ in their overtone spectrum and sound color. The symmetry of a wave can be changed continuously over the time, so that the modulation of the symmetry results in dynamic sound color shifts.

The Waveform Modulation Synthesis is an extension of the classic pulse wide modulation of square waves to  the waves of any shape. The symmetry of the waves is changed to generate waves with more overtones. The more unsymmetrical a wave is the more overtones it will contain and the more acid it sounds. The symmetry can be modulated with an ADSR-, LFO- or Filter-modulator.

A WFM-generator can produce up to 4 detuned waves with different waveforms (sine , square , triangle, transient … 38). The symmetry of each waves changes from the start to the end of the tone to make the sound dynamic.