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(See the Tremolo properties below.)
The 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 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.
Interface Element |
Description | |||
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Name |
The name of the Effect instance. Effect instances are a group of effect property settings. They can be one of two types: custom instances or ShareSets. Custom instances can be used by only one object, whereas ShareSets can be shared across several objects. | |||
Displays the object's color. Clicking the icon opens the color selector. Select a color to apply it to the object. When you choose a color for an object, a palette icon appears on the selected square, as well as a yellow triangle in the lower-right corner, as shown. To inherit the parent object's color, select the square at the far left of the color selector. | ||||
Inclusion |
Determines whether the element is included in the SoundBanks when they are generated. When selected, the element is included. When unselected, the element is not included. To optimize your sound design for each platform, you might want to exclude certain elements on certain platforms. By default, this check box applies across all platforms. Use the Link indicator to the left of the check box to unlink the element. Then you can customize the state of the check box per platform. When this option is unselected, the property and behavior options in the editor become unavailable. Default value: true | |||
Indicates the number of elements in your project that contain direct references to the object. The icon is displayed in orange when references to the object exist, and in gray when no references exist. Selecting the button opens the Reference View with the object's name in the References to: field. | ||||
Notes |
Additional information about the Effect. | |||
Metering |
Indicates the name of the object currently being metered. | |||
Allows you to browse for other objects to meter.
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Sets the display of the Effect Editor's selected tabs. By default, there is one panel displaying only one selected tab. You can, however, click a splitter button to split the panel into two, either side by side or one on top of the other, for two different tabs. The currently selected option is highlighted with a background color.
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LFO Section | ||||
LFO Depth |
Amount of amplitude modulation applied to the input signal, in percentage. At 0%, the input signal passes through unchanged. At 100%, the signal is modulated to its full range. Default value: 100 Range: 0 to 100 Units: % | |||
LFO Frequency |
Frequency of the modulating signal. Default value: 1 Range: 0.02 to 20000 Units: Hz | |||
LFO Waveform |
Shape of the modulating signal.
Values: Sine, Square, Triangle, Upward sawtooth, Downward sawtooth. Default value: Sine | |||
LFO Smoothing |
Amount of smoothing applied to the modulating signal. It is low-pass filtered by a certain value, mapped from 0 to 100%. At 0%, the signal comes out intact. With higher values, edges and discontinuities are smoothed.
Default value: 0 Range: 0 to 100 Units: % | |||
PWM (Pulse Width Modulation) |
Applies to the square waveform only. Modulates the width of the pulse during one cycle. At 50%, the signal is at its full amplitude for half of the cycle, and is 0 for the other half. Near 100%, the signal is at its full amplitude for almost all the cycle, while it drops to 0 for a very short amount of time. Default value: 50 Range: 0 to 100 Units: % | |||
Initial Phase Section | ||||
Offset |
Offsets phase of the modulating signal of all channels by a specific value.
Default value: 0 Range: -180 to 180 Units: ° | |||
LFO Spread Mode |
Defines how initial phase spread (see parameter “Spread”) is applied across channels. For example, with spread mode set to “Front-Rear”, all front channels start playing with a phase equal to 0, and all rear channels start playing with a phase equal to “Spread”. If present (and processed), the LFE channel is always synchronized with the Front Left channel. Values:
Default value: Left-Right | |||
LFO Phase Spread |
Amount of divergence in initial phase spread across channels. The way in which this value affects each channel depends on the spread mode.
Default value: 0 Range: 0 to 180 Units: ° | |||
Output section | ||||
Output Gain |
Gain to apply to modulated signal. Default value: 0 Range: -24 to 24 Units: dB | |||
Process Center |
Indicates whether the center channel (if present) is modulated or passed through. The center channel is only present in 3.x and 5.x configurations. Default value: true | |||
Process LFE |
Indicates whether the LFE channel (if present) is modulated or passed through. The LFE channel is only present in X.1 configurations. Default value: true |
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