(See the Wwise Tremolo Properties below.)
The Wwise Tremolo plug-in modulates the amplitude of the input signal with an unipolar carrier signal. The carrier's characteristics, like frequency and waveform type, are defined in the "LFO" section of the plug-in's properties.
The amount of modulation, or "depth", can also be specified. The figure below illustrates a signal modulated by a rectangle waveform carrier with two different amounts of modulation.
Some carrier waveforms have intrinsic second order discontinuities (triangle), first order discontinuities (rectangle), or both (sawtooth). The discontinuities may produce undesirable artifacts in the resulting signal, especially at higher frequencies. You can smooth these discontinuities by using the LFO section's smoothing parameter. It applies a low-pass filter to the LFO signal, mapped from 0 to 100% by an exponential function from Nyquist to the LFO's fundamental frequency. The following figure shows a rectangle carrier signal with different smoothing.
The Wwise Tremolo plug-in contains a series of properties, many of which can be edited in real-time and can be mapped to specific Game Parameters using RTPCs. Other properties may be changed using RTPCs, but are only relevant when the Effect starts processing, like the initial phase for example.
The initial phase properties are used to slide the carrier signal in time. You can also specify phase for channels relative to each other, using the spread and spread mode properties. For example, with a 180 degree spread and a Left-Right spread mode, you can transform the Tremolo plug-in into an auto-pan Effect.
Typical frequencies used with a tremolo are in the sub audio range (0.02 to 20 Hz). However, the plug-in also allows using audio frequencies, producing an effect that is akin to ring modulation.
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