The Modulation effect allows the amplitude and frequency to be changed separately.    
The following setting options are available in the Amplitude Modulation area:
Check box
Amplitude Modulation

Activates the settings options for amplitude modulation.

Graph
Modulation signal

Shows the amplitude of the audio signal.

Slider
Frequency

Specifies the frequency of the signal.

Slider
Amplitude Range

Specifies the signal volume.

Drop-down menu
Modulation signal

Selects the signal form that is displayed in the amplitudes modulation graph.

Check box
Blend Edges

Balances different end and start values.
Only activated for self-produced signals.

The following setting options are available in the Frequency Modulation area:
Check box
Frequency Modulation

Activates the settings options for frequency modulation.

Graph
Modulation signal

Shows the frequency of the audio signal.

Slider
Frequency

Specifies the frequency of the signal.

Slider
Depth

Specifies the depth of the signal.

Drop-down menu
Modulation signal

Selects the signal form, for instance, sine, that is displayed in the frequency modulation graph.

Check box
Blend Edges

Balances different end and start values.
Only activated for self-produced signals.

Mix mixes the original signal with the modulated amplitude signal and the modulated frequency signal.
The following sliders are available in the Mix area:
Dry Signal

Indicates the intensity of the original signal.

Amplitude Modulated

Specifies the intensity of the signal with the modulated amplitude.

Frequency Modulated

Specifies the intensity of the signal with the modulated frequency.

 
Frequency
The frequency denotes the oscillations per second of an electrical or magnetic field. With audio files this means that the frequency increases with rising pitch. The unit is Hertz (Hz). The highest magnitude of oscillation is called the amplitude.


Modulation