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# init

Initializes an instance of a slider control.

```
virtual bool init(IOUserAudioDriver *in_driver, bool in_is_settable, uint32_t in_control_value, IOUserAudioSliderRange in_range, IOUserAudioObjectPropertyElement in_control_element, IOUserAudioObjectPropertyScope in_control_scope, IOUserAudioClassID in_control_class_id);
```

## Parameters

`in_driver`

The [`IOUserAudioDriver`](/documentation/AudioDriverKit/IOUserAudioDriver) that owns this object.

`in_is_settable`

A Boolean value that indicates if the control can be set.

`in_control_value`

A <doc://com.apple.documentation/documentation/kernel/uint32_t> value that represents the control’s current value.

`in_range`

The range that defines minimum and maximum values for the slider.

`in_control_element`

An [`IOUserAudioObjectPropertyElement`](/documentation/AudioDriverKit/AudioDriverKit/IOUserAudioObjectPropertyElement) to identify the control.

`in_control_scope`

A [`IOUserAudioObjectPropertyScope`](/documentation/AudioDriverKit/AudioDriverKit/IOUserAudioObjectPropertyScope) indicating the control’s scope: input, output, global, or play-through.

`in_control_class_id`

The [`IOUserAudioClassID`](/documentation/AudioDriverKit/AudioDriverKit/IOUserAudioClassID) of the control.

## Return Value

`true` if initialization succeeded; `false` otherwise.

---

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