---
title: HandleChangeDecibelValue
framework: audiodriverkit
role: symbol
role_heading: Instance Method
path: audiodriverkit/iouseraudiolevelcontrol/handlechangedecibelvalue
---

# HandleChangeDecibelValue

Tells the slider control the decibel value is changing.

## Declaration

```occ
virtual kern_return_t HandleChangeDecibelValue(float in_decibel_value);
```

## Parameters

- `in_decibel_value`: The new decibel value to set.

## Return Value

Return Value kIOReturnSuccess on success, or another value if an error occurs. For a list of error codes, see Error Codes.

## Discussion

Discussion The default implementation calls SetDecibelValue and returns kIOReturnSuccess. Subclass and override this method to handle changes to the stream format and return kIOReturnSuccess upon success.

## See Also

### Supporting Value Changes

- [HandleChangeScalarValue](audiodriverkit/iouseraudiolevelcontrol/handlechangescalarvalue.md)