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LFOs (Low Frequency Oscillator) are used to create modulation of property values over time. The properties of the LFO are:
Interface Element |
Description |
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Depth |
The amplitude variation of the oscillator. Maximum amplitude is 1.0. Default value: 100 Range: 0 to 100 Units: % |
Frequency |
The number of cycles per second. Default value: 1 Range: 0 to 20000 Units: Hz |
Waveform |
The shape of the modulator, from among the following options:
Default value: Sine |
Smoothing |
Low-pass filter over the waveform to smooth hard edges. This parameter can reduce output gain depending on your configuration. For a square waveform with an LFO of 1 Hz, gain reduction can be observed with a smoothing value as low as 30%. The higher the LFO frequency, the lower the smoothing value for which gain reduction is observed (for example, 2 Hz = 25%, 4 Hz = 20%, 8 Hz = 10%). For triangular or sawtooth waveforms, gain reduction can be observed with a smoothing value as low as 10%. Default value: 0 Range: 0 to 100 Units: % |
PWM |
The width of the pulse wave; only applies to the Square waveform. Default value: 50 Range: 0 to 100 Units: % |
Attack |
The time it takes for the oscillator to reach full amplitude. Default value: 0 Range: 0 to 100000 Units: s |
Initial Phase Offset |
The initial phase of the oscillator waveform. Default value: 0 Range: -180 to 180 Units: ° |
Scope |
Define how LFO instances are created:
Default value: Note or Event |
In Wwise, some properties are additive (such as Voice Volume and Voice Pitch), and some are exclusive. When adding an LFO on the additive properties, the LFO modulation is added to the current value of the property. When adding an LFO on the exclusive properties, the LFO modulation replaces the current value of the property.
To modulate the Voice Volume with an LFO:
In the Project Explorer, select an object to add LFO.
In the Primary Editor, go to the RTPC tab.
In the RTPC list, click the [>>] button.
From the selector menu, select Voice Volume.
Click the X-axis selector button.
From the selector menu, select LFO > Default (Custom).
Click the […] button to edit the LFO properties.
Edit the curve to set the range of modulation.
LFO objects can be created as Custom or ShareSet. Custom objects are stored in-place, directly inside the object that has it. ShareSets are stored in a separate work-unit and can be re-used across objects.
Caution | |
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LFO and Envelope modulators' processing time depends on their RTPC usage. For most properties, a modulator is evaluated once per audio control frame. However, for the property Voice Volume, these modulators are evaluated at every audio sample frame. Use them selectively because they can consume a significant amount of a platform's memory and CPU. |
Note | |
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The RTPC cursors for LFO and Envelope modulators do not tell you their specific values at any point in time since they are determined by the modulator's internal properties. |
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