Version
The Time Stretch plug-in can be used to change the speed or duration of an audio signal without affecting its pitch. The plug-in allows for both Time Stretching and time compression with possibly time-varying time scaling ratio during playback. The plug-in is suitable for use on monophonic as well as polyphonic sounds.
Note | |
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This effect is only available within the Actor-Mixer Hierarchy. It is also possible to use it inside the Interactive Music Hierarchy, but this is not recommended as it will affect the timings in an undesirable manner in the context of interactive music. |
Warning | |
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Time compression of streamed assets is not recommended and may cause source starvation due to higher throughput required. Time Stretching on the other hand is not a problem for streaming sounds. |
Choosing the window size parameter is an important step to obtain good quality results. While the default value (2,048) should work well for most content, tuning this parameter is essential for obtaining the best time scaling effect with as little artifacts as possible. While larger window size settings give better frequency resolution, they have less accurate time-domain resolution and thus result in more smearing of transients signal. The window size parameter is thus a compromise between time resolution and frequency resolution.
The ideal window size setting is dependent on audio content where signals with lots of transients (such as punches, drums, and explosions) may benefit from smaller window size settings while harmonic signals with more stable frequency content (such as voices and musical instruments) may work best with larger window size parameter values which provide more accurate frequency resolution.
When planning to make the signal much slower by applying a large Time Stretch setting, larger window size parameter values are often desirable as the frequency resolution gets very noticeable when the sound is playing back very slowly.
The Time Stretch plug-in allows you to choose between two time stretch algorithms: the Classic mode from Wwise version 2021.1 and earlier, and the Transient Preserving mode. The Transient Preserving mode further enables controls to fine tune quality level and stereo processing.
The Time Stretch 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.
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. | |||
(Object Color) |
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 | |||
(Show references) |
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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Time | |
Time Stretch |
Percentage of original sound duration. 100% corresponds to no Time Stretch while 200% is twice as long. Similarly time compression is possible using 50% to get the sound at half the duration. This value supports RTPC and may be smoothly changed during playback without additional artifacts. Default value: 100 Range: 25 to 1600 Units: % of original duration |
Time Stretch Random |
Offsets the Time Stretch factor specified by a random amount up to plus or minus the Time Stretch random value. This will be effective for the whole duration of the voice on which the Time Stretch will be applied. RTPC received during the playback will be considered only on the next playback. Default value: 0 Range: 0 to 200 Units: % of original duration |
Pitch | |
Pitch Shift |
The pitch is raised or lowered by the amount specified by this parameter (in Cents). So, +1200 Cents transposes an octave up and -1,200 is an octave down. This value supports RTPC and may be smoothly changed during playback without additional artifacts. Default value: 0 Range: -4800 to 4800 Units: cents |
Pitch Shift Random |
Offsets the Pitch Shift amount specified by a random amount up to plus or minus the Pitch Shift random value. This will be effective for the whole duration of the voice on which the Pitch Shift will be applied. RTPC received during the playback will be considered only on the next playback. Default value: 0 Range: 0 to 4800 Units: cents |
Quality | |
Window Size |
Larger window size gives better frequency resolution but more smearing of transients. This parameter is thus a compromise between time resolution and frequency resolution. See section above for a more detailed discussion on how to choose the value for this parameter. Default value: 2048 Range: 256 to 8192 Units: Sample frames |
Stretch Mode |
The version of time stretch algorithm to be used. The following options are available:
Default value: Classic |
Quality Level |
Allows fine control of the performance of the improved time stretch algorithm, with the tradeoff of reduced sound quality. This control is only available when Stretch Mode is set to Transient Preserving. With Quality Level at 100, all parts of the sound are processed. As the level decreases, the CPU demands of the algorithm are reduced, with an impact on sound quality. More specifically, lowering the quality slider will introduce a mild noise floor or phasing effect, as the algorithm skips over portions of the input sound spectrum to save on computation. It is recommended to fine tune this parameter while watching the CPU % values in the Performance Monitor. Default value: 100 Range: 0 to 100 |
Output | |
Output Gain |
The amount of gain applied to the output signal after the dynamic compression that makes up for potential gain losses. Default value: 0 Range: -24 to 24 Units: dB |
Stereo Processing |
The method used for handling stereo inputs. This control is only available when Stretch Mode is set to Transient Preserving. The following options are available:
Since the Transient Preserving time stretch mode has a greater effect on the phase of the sound than the Classic stretch mode, the Center Cut option is provided as a way to better preserve complex stereo mixes. Default value: Left Right |
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