> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# FXLOUDNESS_PARAMETERS

> FXLOUDNESS_PARAMETERS

Loudness parameters for the FXLoudness FXAPO, used with IXAPOParameters::SetParameters.

## Syntax

```cpp theme={null}
typedef struct FXLOUDNESS_PARAMETERS {  
    double MomentaryLUFS;  
    double ShortTermLUFS;  
    double IntegratedLUFS;  
    double RangeHigh;  
    double RangeLow;  
    float TruePeak;  
} FXLOUDNESS_PARAMETERS  
```

### Members

*MomentaryLUFS*\
Type: double

Momentary loudness in LUFS.

*ShortTermLUFS*\
Type: double

Short-term loudness in LUFS.

*IntegratedLUFS*\
Type: double

Integrated loudness in LUFS.

*RangeHigh*\
Type: double

High end of the loudness range in LUFS.

*RangeLow*\
Type: double

Low end of the loudness range in LUFS.

*TruePeak*\
Type: float

Peak of the loudness range in decibels.

## Remarks

Loudness Units relative to Full Scale (LUFS) is a synonym for Loudness, K-weighted, relative to Full Scale (LKFS). LUFS was introduced in EBU R128. Each LUFS unit is 1 dB. Loudness supports only FLOAT32 audio format at 48 kHz.

You can insert this optional loudness metering effect using the *CreateFX* API. It allows you to track the loudness level of different voices. The loudness data is reported through Performance Investigator for XBOX (PIX).

> [!NOTE]
>
> PIX is installed only on developer kits and not on retail consoles.

## Requirements

**Header:** xaudio2xbox.h

**Supported platforms:** XBOX One family consoles and XBOX Series consoles

## Conceptual documentation

* [XAudio2 Overview](https://docs.xbox.com/build/console-features/audio/overviews/xaudio2-overview.md)

## See also

[Getting started with XAudio2](https://learn.microsoft.com/windows/win32/xaudio2/getting-started?redirectedfrom=MSDN)\
[PIX](https://docs.xbox.com/tools/tools-console/pix/pix.md)\
[xaudio2xbox](https://docs.xbox.com/reference/audio/xaudio2xbox/xaudio2xbox_members.md)


## Related topics

- [XAudio2Xbox](https://docs.xbox.com/reference/audio/xaudio2xbox/xaudio2xbox_members.md)
- [EDS Parameters](https://docs.xbox.com/reference/live/rest/additional/edsparameters.md)
- [Paging Parameters](https://docs.xbox.com/reference/live/rest/additional/pagingparameters.md)
- [PIXCaptureParameters](https://docs.xbox.com/reference/tools/pix3/structs/pixcaptureparameters.md)
- [XDspActivationParameters](https://docs.xbox.com/reference/audio/xdspaudio/structs/xdspactivationparameters.md)