# FMOD has no sound on the HarmonyOS system

**URL:** <https://qa.fmod.com/t/fmod-has-no-sound-on-the-harmonyos-system/22125>\
**Category:** FMOD Engine\
**Tags:** ios, android, cpp\
**Created:** [September 25, 2024, 7:07am UTC](https://qa.fmod.com/t/fmod-has-no-sound-on-the-harmonyos-system/22125 "2024-09-25T07:07:32Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![li\_fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/li_fmod/32/6577_2.png) [@li\_fmod](https://qa.fmod.com/u/li_fmod)\
**Post date:** [October 28, 2024, 4:54am UTC](https://qa.fmod.com/t/fmod-has-no-sound-on-the-harmonyos-system/22125/6 "2024-10-28T04:54:06Z")

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HI, since Connor is away, I will be continuing the investigation.

> [@chensheng990518](#):
>
> but this is how it performs on the HarmonyOS platform.

Unfortunately, I was not able to reproduce the issue. Does the sound only play faster than expected on Harmony OS platform? Does this issue occur with all events or just specific ones? Would it be possible to elaborate on how to reproduce the issue?

You could consider using [FMOD Engine | 7. Core API Reference | | Channel::setFrequency](https://fmod.com/docs/2.02/api/core-api-channel.html#channel_setfrequency) to directly reduce the frequency, setting it to half of a typical 44100Hz rate (22050 Hz) to see if it slows down the playback speed.

Alternatively, you could enable fast mode on the HarmonyOs platform to see if it helps.

I will link the detailed process here:

> [@鸿蒙系统下fmod声音被闹钟中断后没有恢复如何解决](https://qa.fmod.com/t/fmod/22108/9):
>
> 感谢你分享的信息以及让我们注意到这个问题。 经过测试后我发现，在团结引擎里为了确保音频驱动能够正确切换为快速模式（Fast Mode），需要在 FMOD 序列化之前（即预初始化阶段）完成设置。 详细的设置方式可以看一下这个链接：[Unity Integration | 11. Scripting Examples | Callback Handler](https://www.fmod.com/docs/2.02/unity/examples-callback-handler.html) 具体流程如下： 新建一个 CallbackHandler 脚本 using System; using UnityEngine; [CreateAssetMenu(menuName = "My FMOD Callback Handler")] public class MyFMODCallbackHandler : FMODUnity.PlatformCallbackHandler { public override void PreInitialize(FMOD.Studio.System studioSystem, Action\<FMOD.RESULT, string\> reportResult) { …

Hope this helps! let me know if the issue persists.

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