TERA
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Surround Sound Configuration
By Draxenath
Getting Surround Sound to work on TERA is undocumented and hard to figure out. Some sound cards only output Stereo by default. It requires some tweaking and knowledge of the game's engine.

Some sound card drivers handle it without issues. Some cards have Dolby Digital software which takes care of things. For Realtek HD Audio with Optical output connected to a receiver, you just have to open Realtek Audio Manager and configure the Default Audio Format to DTS Interactive (5.1 Surround) and you are good to go.

If you want Surround Sound but use any other sound card, regular speakers through the 3.5 mm jacks, or HDMI Audio to connect to a receiver or some other form, you are probably getting only Stereo sound, this guide is for you.
   
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Introduction
TERA uses the OpenAL sound driver for audio output. Some sound cards and audio devices don't include OpenAL support, so they are handled as Stereo only. This guide will help you install and configure the OpenAL Soft device, which properly handles surround sound for most sound cards and audio devices.
Install the OpenAL Soft device
Get the DLL files
Download the latest Win32 and Win64 binaries of OpenAL Soft device from here: https://www.openal-soft.org/

Unzip the file. You will see several folders. Go into the "bin" folder.

If your Windows is 64-bit
Copy soft_oal.dll from the Win32 folder into C:\Windows\SysWOW64
Copy soft_oal.dll from the Win64 folder into C:\Windows\System32

If your Windows is 32-bit
Copy soft_oal.dll from the Win32 folder into C:\Windows\System32

Optional Configuration
The OpenAL Soft binaries zip file includes a Configuration Tool which allows you to set configuration options for OpenAL Soft device. It's usually not necessary, but you can tweak the configuration if you like.

The tool is found in the "alsoft-config" folder.
Configure TERA
Edit the BaseEngine.ini file
Go into your TERA installation folder. It usually resides in:
C:\Program Files (x86)\Steam\steamapps\common\TERA

From the TERA installation folder, go into the Client\Engine\Config folder and open the BaseEngine.ini file with a plain text editor like Notepad.

Go to the [ALAudio.ALAudioDevice] section and edit the DeviceName as follows:
DeviceName=OpenAL Soft

Save and close the file.

Edit the S1Engine.ini file
From the TERA installation folder, go into the Client\S1Game\Config folder and open the S1Engine.ini file with a plain text editor like Notepad.

Go to the [ALAudio.ALAudioDevice] section and edit the DeviceName as follows:
DeviceName=OpenAL Soft

Save and close the file.
Launch TERA
After following the above steps, TERA will use the OpenAL Soft device, and your previously unsupported sound device will now be playing in Surround Sound.