Pulse width modulation
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modulation of the symmetry of a square waveform. this generates a lot more higher harmonics spectra / overtones.
nice for fatten or thicken up sounds like pads / strings and fat basses, especially introduced on smaller synthesizers to get a bigger sound our of one oscillator.
short: PWM
the Pulse Width (PW) is fixed while PWM is the modulation of the symmetry.
