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

# soPhonemeCallBack

## Declaration

```occ
soPhonemeCallBack = 'phcb'
```

## 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](../speechphonemeprocptr.md). Passing `NULL` in `speechInfo` disablesthe phoneme callback function.

This selector works with the `SetSpeechInfo` function.