HDR category: Audio Busses

Using the properties in the HDR category, you can define the HDR behavior for the current bus.

	Note
	HDR is not available for Master Audio Busses.

Each HDR bus maintains an HDR window, whose position and width is defined by the level of the loudest sound at any moment, and the project's volume threshold respectively. Refer to the Project Settings for more information about the project's Volume Threshold. The behavior of the HDR window can be edited in the HDR properties of each HDR bus. There are two sets of controls; those that affect the behavior of the window with regard to levels (gain computer), and those that affect it with regard to time (ballistics).

H DR
Interface element	Description
Specific
Enable HDR	Defines if the bus has HDR enabled. Refer to Using HDR for more details. Default value: false
Dynamics
Threshold	Defines the minimum input level, in dB, above which the HDR window may slide. Refer to Working with the HDR Threshold for more details. Default value: 0 Range: -96 to 96
Release Time	Defines the rate at which the HDR window falls back to rest when the target is below the current value. In Linear Mode (see below), it is the time in seconds it takes to drop by approximately 10 decibels. In Exponential Mode, it is the time in seconds it takes to reach approximately 0.37 (1/e) of the difference between the target and the current value. Refer to Working with HDR Ballistics for more details. Default value: 0 Range: 0 to 20 Units: s
HDR Ratio	This control behaves similarly to the ratio control in an audio compressor. It is a measure of how close the HDR window follows peaks. At very large values, the HDR window follows peaks closely, so that two sounds, one peaking at 20 dB and the other peaking at 40 dB above threshold, come out at the same level of 0 dBFS, as long as they are not played at the same time. The difference between the two is that the latter will result in an attenuation of -20 dB to sounds below threshold, while the former will result in an attenuation of -40 dB. At lower ratios, say 4, a sound peaking at +20 dB comes out at +5 dB while a sound peaking at +40 dB comes out at +10 dB. The attenuation that results on sounds below threshold is -15 dB and -30 dB respectively. Using lower ratios is therefore useful in order to gain back “global” dynamic range for sounds above threshold that is otherwise taken away by the HDR system. The drawback is that sounds may peak above threshold, so you need to keep sufficient headroom after the HDR bus in order to avoid clipping. Refer to Working with the HDR Ratio for more details. Default value: 100 Range: 1 to 100
HDR Release Time Mode	Defines the behavior when the window releases to a lower value. In Linear Mode, the window top moves linearly in the dB scale (that is, exponentially in the linear scale). In Exponential Mode, it moves exponentially in the dB scale. The speed at which it does depends on the Release Time (see above). Refer to Working with HDR Ballistics for more details. Default value: Exponential
Window Top Output Game Parameter
HDR Window Top Output Game Parameter	Defines the Game Parameter that will receive the HDR window position. Refer to Using the HDR Window as an Input Variable for more details.
HDR Output Game Parameter Min	Defines the minimum value that can be set on the Game Parameter. Default value: 0 Range: -100 to 100 Units: dB
HDR Output Game Parameter Max	Defines the maximum value that can be set on the Game Parameter. Default value: 100 Range: -100 to 100 Units: dB

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