FabFilter One Help
So far, we've discussed how to use the oscillator, the filter, and the envelope generator to create basic sounds. To make things more interesting, you can also let the synthesizer adjust the oscillator frequency and the filter cut-off frequency dynamically while playing a sound. This is called modulation.
You can modulate the oscillator frequency and filter cut-off frequency with the modulation generator and the envelope generator. The filter cut-off frequency can also be modulated by velocity.
The modulation generator generates a low-frequency square or triangle wave. Use this to adjust the oscillator frequency and the filter cut-off frequency periodically. The amount of modulation is controlled with the MG knobs. The modulation generator contains the following settings:
You can also switch between square waves and triangle waves. Triangle waves are good to slowly change the filter cut-off frequency or to simulate a car siren. The square wave form is very useful to repeatedly switch between two different tones. With the frequency modulation MG knob, you can tune the two tones to be exactly one octave apart, for example.
The envelope generator enables you to modulate the sound dynamically while you press and release keys. The amount of modulation is controlled with the EG knobs. Modulating the filter cut-off frequency with the envelope generator is essential for creating percussive attack effects and simulating real instruments.
When the envelope generator is in its sustain stage, it has no effect as a modulator. In the attack or decay stage, it increases the oscillator or cut-off frequency; in the release stage, it decreases the frequency. It depends on the EG knobs how much the frequency is changed.
Next: Modulation: I can't stop