---
title: synthSubType
framework: applicationservices
role: symbol
role_heading: Instance Property
path: applicationservices/speechversioninfo/1460351-synthsubtype
---

# synthSubType

The specific type of the synthesizer. Currently, no specific types of synthesizer are defined. If you define a new type of synthesizer, you should register the four-character code for your type with Developer Technical Support.

## Declaration

```swift
var synthSubType: OSType
```