---
title: AUImplementorValueProvider
framework: audiotoolbox
role: symbol
role_heading: Type Alias
path: audiotoolbox/auimplementorvalueprovider
---

# AUImplementorValueProvider

A block called to fetch a parameter’s current value from the audio unit implementation.

## Declaration

```swift
typealias AUImplementorValueProvider = (AUParameter) -> AUValue
```

## Discussion

Discussion This block is only of interest to audio unit subclasses. The block returns the current value of the parameter. The block takes the following parameters:

## See Also

### Related Documentation

- [implementorValueProvider](audiotoolbox/auparameternode/implementorvalueprovider.md)

### Audio Unit Types

- [ScheduledAudioFileRegion](audiotoolbox/scheduledaudiofileregion.md)
- [ScheduledAudioSlice](audiotoolbox/scheduledaudioslice.md)
- [ScheduledAudioFileRegionCompletionProc](audiotoolbox/scheduledaudiofileregioncompletionproc.md)
- [ScheduledAudioSliceCompletionProc](audiotoolbox/scheduledaudioslicecompletionproc.md)
- [MIDIChannelNumber](audiotoolbox/midichannelnumber.md)
- [AUAudioObjectID](audiotoolbox/auaudioobjectid.md)
- [AUMIDICIProfileChangedBlock](audiotoolbox/aumidiciprofilechangedblock.md)
- [AUAudioChannelCount](audiotoolbox/auaudiochannelcount.md)
- [AUAudioFrameCount](audiotoolbox/auaudioframecount.md)
- [AUAudioUnitStatus](audiotoolbox/auaudiounitstatus.md)
- [AUEventListenerProc](audiotoolbox/aueventlistenerproc.md)
- [AUEventListenerRef](audiotoolbox/aueventlistenerref.md)
- [AUEventSampleTime](audiotoolbox/aueventsampletime.md)
- [AUImplementorValueObserver](audiotoolbox/auimplementorvalueobserver.md)
- [AUInputHandler](audiotoolbox/auinputhandler.md)