# Unity C# How to use callback in StudioEventEmitter.cs

**URL:** <https://qa.fmod.com/t/unity-c-how-to-use-callback-in-studioeventemitter-cs/14434>\
**Category:** FMOD Engine\
**Created:** [March 12, 2019, 2:37am UTC](https://qa.fmod.com/t/unity-c-how-to-use-callback-in-studioeventemitter-cs/14434 "2019-03-12T02:37:11Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![123455151](https://avatars.discourse-cdn.com/v4/letter/1/f4b2a3/32.png) [@123455151](https://qa.fmod.com/u/123455151)\
**Post date:** [March 12, 2019, 2:37am UTC](https://qa.fmod.com/t/unity-c-how-to-use-callback-in-studioeventemitter-cs/14434/1 "2019-03-12T02:37:11Z")

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Using scripts in APIdocument ,I have succeeded in use EVENT\_CALLBACK\_TYPE in TIMELINE\_MARKER

But when I use this pattern in StudioEventEmitter.cs,it doesn’t work.

 ![3](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/1X/b8ce995341f878fb7fc62c0abfd3e5109b08b373.png)

Could anyone help me?

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<div class="post-metadata">

**Author:** ![123455151](https://avatars.discourse-cdn.com/v4/letter/1/f4b2a3/32.png) [@123455151](https://qa.fmod.com/u/123455151)\
**Post date:** [March 12, 2019, 3:32am UTC](https://qa.fmod.com/t/unity-c-how-to-use-callback-in-studioeventemitter-cs/14434/2 "2019-03-12T03:32:38Z")

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![4](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/1X/4b4be526385cb2cbaf115244048536cc9ab80263.png)

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**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\
**Post date:** [March 18, 2019, 1:32am UTC](https://qa.fmod.com/t/unity-c-how-to-use-callback-in-studioeventemitter-cs/14434/3 "2019-03-18T01:32:04Z")

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What exactly do you mean by it isn’t working?  
Do you get any errors or warnings?