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

# soVolume

## Declaration

```occ
soVolume = 'volm'
```

## Discussion

Get or set the speech volume for a speech channel.The `speechInfo` parameteris a pointer to a variable of type `Fixed`.Volumes are expressed in fixed-point units ranging from 0.0 through1.0. A value of 0.0 corresponds to silence, and a value of 1.0 correspondsto the maximum possible volume. Volume units lie on a scale thatis linear with amplitude or voltage. A doubling of perceived loudnesscorresponds to a doubling of the volume.

This selector works with both the `GetSpeechInfo` and `SetSpeechInfo` functions.