---
title: IOUserAudioLevelControl
framework: audiodriverkit
role: symbol
role_heading: Class
path: audiodriverkit/iouseraudiolevelcontrol
---

# IOUserAudioLevelControl

A control object that supports setting an audio level, with either scalar or decibel values.

## Declaration

```occ
class IOUserAudioLevelControl;
```

## Topics

### Creating a Level Control

- [Create](audiodriverkit/iouseraudiolevelcontrol/create.md)
- [init](audiodriverkit/iouseraudiolevelcontrol/init.md)
- [IOUserAudioDriver](audiodriverkit/iouseraudiodriver.md)
- [IOUserAudioLevelControlRange](audiodriverkit/iouseraudiolevelcontrolrange.md)
- [IOUserAudioObjectPropertyElement](audiodriverkit/audiodriverkit/iouseraudioobjectpropertyelement.md)
- [IOUserAudioObjectPropertyScope](audiodriverkit/audiodriverkit/iouseraudioobjectpropertyscope.md)

### Freeing a Level Control

- [free](audiodriverkit/iouseraudiolevelcontrol/free.md)

### Getting Information About the Class

- [GetClassID](audiodriverkit/iouseraudiolevelcontrol/getclassid.md)
- [GetBaseClassID](audiodriverkit/iouseraudiolevelcontrol/getbaseclassid.md)
- [IOUserAudioClassID](audiodriverkit/audiodriverkit/iouseraudioclassid.md)

### Supporting Value Changes

- [HandleChangeScalarValue](audiodriverkit/iouseraudiolevelcontrol/handlechangescalarvalue.md)
- [HandleChangeDecibelValue](audiodriverkit/iouseraudiolevelcontrol/handlechangedecibelvalue.md)

### Accessing the Value

- [SetScalarValue](audiodriverkit/iouseraudiolevelcontrol/setscalarvalue.md)
- [GetScalarValue](audiodriverkit/iouseraudiolevelcontrol/getscalarvalue.md)
- [SetDecibelValue](audiodriverkit/iouseraudiolevelcontrol/setdecibelvalue.md)
- [GetDecibelValue](audiodriverkit/iouseraudiolevelcontrol/getdecibelvalue.md)

## Relationships

### Inherits From

- [IOUserAudioControl](audiodriverkit/iouseraudiocontrol.md)

## See Also

### Using Audio Controls

- [IOUserAudioControl](audiodriverkit/iouseraudiocontrol.md)
- [IOUserAudioBooleanControl](audiodriverkit/iouseraudiobooleancontrol.md)
- [IOUserAudioStereoPanControl](audiodriverkit/iouseraudiostereopancontrol.md)
- [IOUserAudioSliderControl](audiodriverkit/iouseraudioslidercontrol.md)
- [IOUserAudioSelectorControl](audiodriverkit/iouseraudioselectorcontrol.md)