High dynamic range audio (HDR audio) is a technique to design a mix using level values spanning across a very high dynamic range as occurs in nature. HDR is also a run-time system that dynamically maps this wide range of levels to a range that is more suited to your sound system's digital output. The HDR tab is where you define the HDR behavior and properties for the selected bus or, in a more limited fashion, audio structure.
The following figure shows the HDR tab for an audio bus.
The following figure shows the HDR tab for an audio structure.