How do you perform a Pulse Width Modulation, the modulating of a square wave from open to closed?
I could always program this easily on other synths but have not learned how to do this on the Voyager.
Modulate the waveform of one of the oscillators. You can turn the waveform to about the middle between the square wave and the short-duty pulse wave and attenuate an lfo or eg signal into it
Hello,
For conventional pulse width modulation (modifying with a selected cv source, the duty cycle of the square wave), you first set the oscillator of choice on the square wave setting (7 on the panel legend).
Assign the pedal or mod wheel bus destination to “wave”, and assign the source of your choice
(conventionally, the normalled pwm source on most synths is a triangle or sine wave from the LFO).
In the mod wheel bus the wheel will engage the pulse with modulation effect, and the amount knob in the same bus will preset the maximum amount of source cv that will be routed to Wave function.
If you’re using the pedal bus with no pedal plugged into the Voyager, the amount knob in the pedal bus section will directly engage the pwm effect. If you’re using a cv pedal for the pedal mod bus, the amount knob will preset the maximum cv source amount routed to the destination (wave), with the pedal engaging the effect.
The calibrated range of the pulse width duty cycle on the Vger is from 50% (Square value; #7 on panel legend) to 5% (#10 on panel legend).
If too much contol voltage is sent to the wave function (especially if set to one of the higher numeric wave values), that parameter will be overmodulated and you will hear the oscillator signal audibly disappear as the duty cycle of the pulse wave passes it’s lowest value (1%).
Generally, the most common range for modulating the pulse width on most synthesizers is between 50% and 10%.
Greater than this, and the effect tends to take on a more uneven character, as you can hear the audio thinning out as the pulse wave’s lowest duty cycle value is reached.
It should be noted that the waveform modulation function on the Vger affects all three oscillators simultaneously.
If you go for the effect on oscillator 1, for example, the other oscillators will also deviate from their waveform setting by the same amount. The direction of the deviation on the wave selector will be clockwise, starting from its set numeric value on the legend, toward the higher numeric wave settings, and beyond to inaudible if the wave function is overmodulated.
Regards,
Lawrence