# How do I change the FMOD\_INIT\_VOL0\_BECOMES\_VIRTUAL flag in unity?

**URL:** <https://qa.fmod.com/t/how-do-i-change-the-fmod-init-vol0-becomes-virtual-flag-in-unity/17521>\
**Category:** Unity\
**Created:** [August 3, 2021, 3:11pm UTC](https://qa.fmod.com/t/how-do-i-change-the-fmod-init-vol0-becomes-virtual-flag-in-unity/17521 "2021-08-03T15:11:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Danielkotzer](https://avatars.discourse-cdn.com/v4/letter/d/59ef9b/32.png) [@Danielkotzer](https://qa.fmod.com/u/Danielkotzer)\
**Post date:** [August 3, 2021, 3:11pm UTC](https://qa.fmod.com/t/how-do-i-change-the-fmod-init-vol0-becomes-virtual-flag-in-unity/17521/1 "2021-08-03T15:11:26Z")

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Hi,

Need a simple C# code for change the FMOD\_INIT\_VOL0\_BECOMES\_VIRTUAL flag in unity, thank you very much.

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**Author:** ![richard\_simms](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/richard_simms/32/261_2.png) [@richard\_simms](https://qa.fmod.com/u/richard_simms)\
**Post date:** [August 6, 2021, 5:37am UTC](https://qa.fmod.com/t/how-do-i-change-the-fmod-init-vol0-becomes-virtual-flag-in-unity/17521/2 "2021-08-06T05:37:51Z")

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When using Unity, you need to utilize a PlatformCallbackHandler in order to manipulate the init flags of the FMOD systems. Please see our docs for more info:

[https://fmod.com/resources/documentation-unity?version=2.02&page=examples-callback-handler.html](https://fmod.com/resources/documentation-unity?version=2.02&page=examples-callback-handler.html)