---
title: soPhonemeCallBack
framework: applicationservices
role: symbol
role_heading: Global Variable
path: applicationservices/sophonemecallback
---

# soPhonemeCallBack

## Declaration

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

## Discussion

Discussion Set the callback function to be called everytime the Speech Synthesis Manager is about to generate a phonemeon the speech channel. The speechInfo parameteris a pointer to an application-defined phoneme callback function,whose syntax is described in SpeechPhonemeProcPtr. Passing NULL in speechInfo disablesthe phoneme callback function. This selector works with the SetSpeechInfo function.