---
title: kMTAudioProcessingTapCallbacksVersion_0
framework: mediatoolbox
role: symbol
role_heading: Global Variable
path: mediatoolbox/kmtaudioprocessingtapcallbacksversion_0
---

# kMTAudioProcessingTapCallbacksVersion_0

An identifier for version 0 of the callbacks structure.

## Declaration

```swift
var kMTAudioProcessingTapCallbacksVersion_0: Int32 { get }
```