---
title: AudioUnitParameterHistoryInfo
framework: audiotoolbox
role: symbol
role_heading: Structure
path: audiotoolbox/audiounitparameterhistoryinfo
---

# AudioUnitParameterHistoryInfo

The suggested update rate and history duration for parameters which have the flag_PlotHistory flag set.

## Declaration

```swift
struct AudioUnitParameterHistoryInfo
```

## Overview

Overview The structure is filled out by getting the value of the kAudioUnitProperty_ParameterHistoryInfo property.

## Topics

### Initializers

- [init()](audiotoolbox/audiounitparameterhistoryinfo/init().md)
- [init(updatesPerSecond:historyDurationInSeconds:)](audiotoolbox/audiounitparameterhistoryinfo/init(updatespersecond:historydurationinseconds:).md)

### Instance Properties

- [historyDurationInSeconds](audiotoolbox/audiounitparameterhistoryinfo/historydurationinseconds.md)
- [updatesPerSecond](audiotoolbox/audiounitparameterhistoryinfo/updatespersecond.md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Sendable](swift/sendable.md)

## See Also

### Structures

- [AudioUnitConnection](audiotoolbox/audiounitconnection.md)
- [AudioUnitEvent](audiotoolbox/audiounitevent.md)
- [AudioUnitExternalBuffer](audiotoolbox/audiounitexternalbuffer.md)
- [AudioUnitFrequencyResponseBin](audiotoolbox/audiounitfrequencyresponsebin.md)
- [AudioUnitMeterClipping](audiotoolbox/audiounitmeterclipping.md)
- [AudioUnitMIDIControlMapping](audiotoolbox/audiounitmidicontrolmapping.md)
- [AudioUnitOtherPluginDesc](audiotoolbox/audiounitotherplugindesc.md)
- [AudioUnitParameter](audiotoolbox/audiounitparameter.md)
- [AudioUnitParameterEvent](audiotoolbox/audiounitparameterevent.md)
- [AudioUnitParameterNameInfo](audiotoolbox/audiounitparameternameinfo.md)
- [AudioUnitParameterIDName](audiotoolbox/audiounitparameteridname.md)
- [AudioUnitParameterInfo](audiotoolbox/audiounitparameterinfo.md)
- [AudioUnitParameterOptions](audiotoolbox/audiounitparameteroptions.md)
- [AudioUnitParameterStringFromValue](audiotoolbox/audiounitparameterstringfromvalue.md)
- [AudioUnitParameterValueFromString](audiotoolbox/audiounitparametervaluefromstring.md)