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# AUParameterGroup

A parameter group object represents a group of related audio unit parameters.

```
class AUParameterGroup
```

## Overview

A parameter group is KVC-compliant for its children. For example, calling the parameter group’s <doc://com.apple.documentation/documentation/ObjectiveC/NSObject-swift.class/value(forKey:)> method, with a key value of *volume*, returns a child whose [`identifier`](/documentation/AudioToolbox/AUParameterNode/identifier) value matches that key.

## Topics

### Obtaining Group Parameters

[`allParameters`](/documentation/AudioToolbox/AUParameterGroup/allParameters)

Returns a flat array of all parameters in the group, including those in child groups.

[`children`](/documentation/AudioToolbox/AUParameterGroup/children)

The group’s child nodes.

## Relationships

### Conforms To

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`Equatable`](/documentation/Swift/Equatable)

[`Hashable`](/documentation/Swift/Hashable)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`NSCoding`](/documentation/Foundation/NSCoding)

[`CVarArg`](/documentation/Swift/CVarArg)

[`NSSecureCoding`](/documentation/Foundation/NSSecureCoding)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

### Inherits From

[`AUParameterNode`](/documentation/AudioToolbox/AUParameterNode)

### Inherited By

[`AUParameterTree`](/documentation/AudioToolbox/AUParameterTree)

---

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