# In iOS, how to merge audio and export it to a sandbox file
**URL:** https://qa.fmod.com/t/in-ios-how-to-merge-audio-and-export-it-to-a-sandbox-file/21491
**Category:** 中文支持
**Tags:** ios
**Created:** [April 12, 2024, 8:24am UTC](https://qa.fmod.com/t/in-ios-how-to-merge-audio-and-export-it-to-a-sandbox-file/21491 "2024-04-12T08:24:31Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@magic\_geng](https://qa.fmod.com/u/magic_geng)
#### Post date: [April 12, 2024, 8:24am UTC](https://qa.fmod.com/t/in-ios-how-to-merge-audio-and-export-it-to-a-sandbox-file/21491/1 "2024-04-12T08:24:31Z")
int play\_start(FPlayer \*play, char \*names,int length)
{
int err = 0;
```
for (int i =0; i < length; i ++) {
err = FMOD_System_CreateStream(play->system,names[i], FMOD_DEFAULT, 0, &play->sounds[i]);
if(err!=0) return -1;
err = FMOD_Sound_SetMode(play->sounds[i],FMOD_LOOP_NORMAL|FMOD_CREATESTREAM);
if(err != 0) return -1;
err = FMOD_System_PlaySound(play->system, play->sounds[i], play->channelGroup, false, &play->channels[i]);
if(err != 0) return -1;
err = FMOD_System_CreateDSPByType(play->system, FMOD_DSP_TYPE_PITCHSHIFT, &play->dsps[i]);
if(err != 0) return -1;
}
if(err!=0)return -1;
play->flag = 1;
return err;
```
}
我设置了多个音频播放，怎么合并导出到沙盒文件
---
### Author:  [@Connor\_FMOD](https://qa.fmod.com/u/Connor_FMOD)
#### Post date: [April 16, 2024, 1:15am UTC](https://qa.fmod.com/t/in-ios-how-to-merge-audio-and-export-it-to-a-sandbox-file/21491/2 "2024-04-16T01:15:37Z")
您好！请问您使用的是哪种引擎？是Unity、Unreal还是其他引擎？能否请您提供一下您所使用的Unity插件版本号，Unreal引擎的版本号以及FMOD的版本号？
如果您能详细说明一下您正在寻找的功能，或者提供更多关于您需要的功能的详细信息，我们将能更好地理解您的需求。
我们下面提供的文档详细介绍了如何更改FMOD系统的输出设置，文档中还包括如何设置.wav文件的输出路径的信息。如果您有任何问题，请随时告诉我们。
链接如下：
如何设置输出.wav文件 - [FMOD Engine | Core API Reference - System: FMOD\_OUTPUTTYPE](https://fmod.com/docs/2.02/api/core-api-system.html#fmod_outputtype)
如何设置输出路径 - [FMOD Engine | Core API Reference - System: System::setOutputByPlugin](https://fmod.com/docs/2.02/api/core-api-system.html#system_setoutput)