Fixing Custom Audio - idStudio

For creating custom music, follow this guide before proceeding - https://wiki.eternalmods.com/books/0-idstudio/page/creating-custom-music-idstudio

Note: Packaging custom music in your mod is currently bugged (as of the patch from May 19, 2026) and will disable vanilla music & SFX. Wait for a future patch or follow this guide before uploading a mod with custom music.

Note: This is an advanced guide and assumes the viewer has adept knowledge of Wwise and FusionTools.

Context (What's Broken?)

After creating custom music and/or SFX, you will notice that all vanilla music & TAG2/Horde SFX are silent. Vanilla music is broken due to ID conflicts between the mus.pck & music_mods.pck files. TAG2/Horde SFX is broken due to a missing containerMask in the mods.pck file.

Fixing SFX

Download the fixed soundmetadata.bin file modified by FlavorfulGecko5 - https://drive.google.com/file/d/13UzqXSEA9_NWH8LAXVhIlWnnMYMixApy

Move the fixed soundmetadata.bin file in your mod's \base\sound\soundbanks\pc folder and overwrite the existing one

Creating a new mod in idStudio will generate a new (broken) \base\sound\soundbanks\pc\soundmetadata.bin file in case you need it

All vanilla SFX are now fixed. Some SFX will still be muted in idStudio, but will play without error when packaged and tested in the Sandbox.

Fixing Music

Download FusionTools version 2.0.1 or later - https://www.nexusmods.com/site/mods/1812

May prompt to install Microsoft .NET

Download the fixed MusicSwitchContainer HIRC object modified by Velser - https://drive.google.com/file/d/1Shuo0EaI16S6stjp8HEz5tKv2Ha4Gb6l

Create a backup copy of your \base\sound\soundbanks\pc\music_mods.pck file in case you encounter issues

Launch FusionTools.exe -> File -> Open -> open the music_mods.pck file

Find the HIRC object with the ID 483143099

You can quickly search for the ID in the Filter... text input box

Right click the MusicSwitchContainer [1CCC2DBB] HIRC object -> Import HIRC from XML -> open the 483143099.xml fix so it will overwrite the object

Go to File -> Save As -> Save and overwrite the \base\sound\soundbanks\pc\music_mods.pck file

All vanilla music are now fixed. Some menu music will be muted in idStudio, but will play without error when packaged and tested in the Sandbox.

Fixing TAG Menu Music

There are some additional ID conflicts for menu music.This step may not be necessary, but is helpful for cleanup.

In FusionTools, right click the parent HIRC tree -> Export HIRC to XML -> save anywhere

Open the HIRC.xml file with a raw text editor

Scroll to the bottom of the file and delete the following fields

 <EventAction ID="178021616" Name="178021616" Type="3">

 <field Name="ActionType" Type="UInt16">1027</field>

 <field Name="ObjectID" Type="UInt32">483143099</field>

 <field Name="Unk00" Type="Byte">0</field>

 <List Name="Props" Type="Prop" />

 <List Name="Modifiers" Type="RangedModifier" />

 <Array Name="ActionData" Type="Byte">

 04 B6 0B 2C 59 

 </Array>

 </EventAction>

 <Event ID="1699343283" Name="Play_music_menu" Type="4">

 <List Name="Actions" Type="UInt32">

 <field Type="UInt32">178021616</field>

 </List>

 </Event>

Save, return to FusionTools, right click the parent HIRC tree -> Import HIRC to XML -> open the HIRC.xml file

These HIRC objects were deleted, they had ID conflicts with the mus.pck file and were missing some data.

EventAction [0A9C64F0]

Event - Play_music_menu [6549EBB3]

TAG menu music may still be muted in idStudio, but will now work in the Sandbox.