---
title: soSyncCallBack
framework: Application Services
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.0+]
path: applicationservices/1552228-speech-channel_information_constants/sosynccallback
---

# soSyncCallBack

## Declaration

```occ
soSyncCallBack = 'sycb'
```

## 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](../speechsyncprocptr.md).Passing `NULL` in `speechInfo` disablesthe synchronization callback function.

This selector works with the `SetSpeechInfo` function.