# Channelgroup is not working

**URL:** <https://qa.fmod.com/t/channelgroup-is-not-working/18923>\
**Category:** Unity\
**Tags:** unity, csharp\
**Created:** [June 21, 2022, 8:34am UTC](https://qa.fmod.com/t/channelgroup-is-not-working/18923 "2022-06-21T08:34:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![GGR](https://avatars.discourse-cdn.com/v4/letter/g/d78d45/32.png) [@GGR](https://qa.fmod.com/u/GGR)\
**Post date:** [June 21, 2022, 8:34am UTC](https://qa.fmod.com/t/channelgroup-is-not-working/18923/1 "2022-06-21T08:34:52Z")

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QAQ  
here is my script:  
var instance = RuntimeManager.CreateInstance(eventName);  
instance.getChannelGroup(out ChannelGroup group);  
group.setVolume(0);  
instance.start();

the result is Volume can’t change. but if i use [getMasterChannelGroup] and set Volume it work.  
can anyone help?

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<div class="post-metadata">

**Author:** ![jeff\_fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/jeff_fmod/32/1766_2.png) [@jeff\_fmod](https://qa.fmod.com/u/jeff_fmod)\
**Post date:** [June 23, 2022, 5:59am UTC](https://qa.fmod.com/t/channelgroup-is-not-working/18923/2 "2022-06-23T05:59:42Z")

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Can I please grab a little more info?  
Are you doing all of this in Start()?  
I found calling `getChannelGroup` immediately after `CreateInstance` inside Start() meant that the ChannelGroup hadn’t been created yet.  
I suggest you check the [`FMOD.RESULT`](https://fmod.com/resources/documentation-api?version=2.02&page=core-api-common.html#fmod_result), which gives you useful information after an API call. This should let you know whether the instance is being created correctly and if there are any issues with the group.

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<div class="post-metadata">

**Author:** ![GGR](https://avatars.discourse-cdn.com/v4/letter/g/d78d45/32.png) [@GGR](https://qa.fmod.com/u/GGR)\
**Post date:** [June 27, 2022, 5:55am UTC](https://qa.fmod.com/t/channelgroup-is-not-working/18923/3 "2022-06-27T05:55:20Z")

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yes, i calling getChannelGroup after Start(),it works, thank you very much!!