---
title: implementorValueProvider
framework: audiotoolbox
role: symbol
role_heading: Instance Property
path: audiotoolbox/auparameternode/implementorvalueprovider
---

# implementorValueProvider

The callback for refreshing known stale values in a parameter tree.

## Declaration

```swift
var implementorValueProvider: AUImplementorValueProvider { get set }
```

## Discussion

Discussion The audio unit should return the current value for this parameter; the parameter node object then stores this value.

## See Also

### Audio Unit Implementations

- [implementorValueObserver](audiotoolbox/auparameternode/implementorvalueobserver.md)
- [implementorStringFromValueCallback](audiotoolbox/auparameternode/implementorstringfromvaluecallback.md)
- [implementorValueFromStringCallback](audiotoolbox/auparameternode/implementorvaluefromstringcallback.md)
- [implementorDisplayNameWithLengthCallback](audiotoolbox/auparameternode/implementordisplaynamewithlengthcallback.md)