---
title: soSyncCallBack
framework: applicationservices
role: symbol
role_heading: Global Variable
path: applicationservices/sosynccallback
---

# soSyncCallBack

## Declaration

```swift
var soSyncCallBack: OSType { get }
```

## Discussion

Discussion Set the callback function to be called whenthe Speech Synthesis Manager encounters a synchronization commandwithin an embedded speech command in text being processed on thespeech channel. The speechInfo parameteris a pointer to an application-defined synchronization callback function,whose syntax is described in SpeechSyncProcPtr.Passing NULL in speechInfo disablesthe synchronization callback function. This selector works with the SetSpeechInfo function.