[OnePlus 8 Pro  Guides, News, & Discussion] Extreme_Ninja2099:
This is a guide to install mods for OP8 Pro that improves the stereo speaker setup. I have helped many OP8 Pro users to achieve this. Some other OP users as well.

Custom ROMs that work with this mod (TESTED):

Stock Oxygen OS 11 (not 12/13)

CrDroid

Evolution X

*I am not responsible for bricked devices, damage to your device*

I am here to post my method for anyone who is interested. I have tested this myself and helped others to do this.

Issues:

IMPORTANT:

Setting SElinux can have security issues noted by @topjohnwu.

Viper4Android can be installed with SElinux Enforcing and Permissive. Choose SElinux Enforcing not Permissive

Installation Method:

With new Viper4Android Repackaged module

If you have other audio mods

Download Audio Modification Library from the links section

Install Audio Modification Library, reboot and disable it

Otherwise, skip to the next step

Download the latest Viper4Android Repackaged module from the links section

If you want to use the extra V4A features...

Download and extract all the guide setup or the other .zip file I attached below on your device. You need the DDC, Kernel and Preset folders.

If you downloaded and extracted on a separate device: Connect your device, copy and paste the folders into your internal storage.

Otherwise, skip to the next step

Install the Viper4Android Repackaged module.

Reboot.

Open the app and grant root

DISCLAIMER: On custom ROMs or certain devices, the drivers are installed, but NOT working properly after reboot. Just continue the method and comment if there are issues once u have finished the method.

If you have Audio Modification Library installed

Now go into magisk manager, go into modules and enable AML.

Reboot

Otherwise, skip to the next step

If u used the guide setup.zip file: in V4A app just press the file icon for presets and choose the preset.

Now make sure V4A driver is running (read Notes) and go into convolver -> impulse response. Choose any kernel, and done. OR choose the preset for that and done. If you have issues, make sure legacy mode is on but it is on by default.

Choose to your heart's desire if you downloaded all the V4A DDC and kernel files.

I personally use Dolby Digital Plus - Centre kernel

Done, also post the settings or kernels and your thoughts. :)

I also attached a screenshot of my configuration

Also, for new users if u connect your earphones like via headphone jack, USB-C or Bluetooth. You can tweak those as well. Not just your SPEAKERS! BUT some earphones can be damaged as well, so tweak them at your own risk.

After much tweaking myself. I think I have made my speakers much better on my 8 Pro.

I have attached a screenshot to the thread at the bottom. I have attached a screenshot for my headphones too!

I have added the individual settings as well. If u want to tweak them just press the text and it should expand.

The toggles I have on are for my speakers:

Master Limiter

Playback gain Control: Strength: 2, Maximum gain: 3X, Output threshold: -1.9dB

Convolver: Dolby Digital Plus - Centre, Cross Channel 100%

Speaker optimization

I have also tweaked my Bluetooth earphones as well with a DDC and the screenshot is attached below. I recommend Dolby headphone Live, but that's up to you.

U can add files in the DDC folders in the Android folder, but reboot and then tweak to see the difference. U CAN RISK DAMAGE IF U TWEAK TOO MUCH

You have completed the guide and can now experience dual/stereo-like speakers on your OP6/6T.

Enjoy :)

If anyone has any issues with this guide. Post a message and I'll get back to you :)

Notes:

Viper4Android sometimes doesn't turn on properly. So, play music and open the app to check the driver. The Driver status if it's working (NEON enable: yes, Enabled: yes, Status: Normal) and turn on the master limiter to see if there's an effect. This should give you an indication if V4A is working or not

I have attached DDC files below and you do the same thing with kernel files, but they are used for headphones.

You can try and use the preset (profiles). You don't have to use the preset files, they are there to make the setup easier for those who don't want to tweak too much.

If u want to add the custom presets:

Choose the specific presets u want

Transfer them into Android -> data -> com.pittvandewitt.viperfx -> files -> presets

Transfer the V4A.zip in internal storage

Reflash the V4A.zip again and reboot

Install the V4A driver again and reboot

V4A driver should be working, check the presets and it should be there

Enjoy having your presets

Fix for V4A:

There has been noted issues during the installation with V4A. If you experienced a bootloop after installing V4A in magisk...

Boot into OrangeFox, -> advanced -> file manager -> data/abd/magisk/modules and delete the V4A folder.

Reboot to system, install the module in magisk again and reboot. It should install.

Another issue was that V4A driver is installed properly, but there are no enhancements to the sound. To fix this, go into settings -> turn on and off the legacy mode toggle. This should restart the effect and make it stay on.

Links:

Modules required

Audio Modification Library Link

Download Viper4Android and one of the preset files if u want Viper4Android installed

Viper4Android Module Link

Viper4Android Repackaged Module Link

All Viper4Android preset files Link

Viper4Android files for this guide is attached below

All DDC, Kernel, and Presets in one zip is attached below

Threads where the modules are from

Audio Modification Library Thread Here

Credits:

@Zackptg5 for his Audio Modification Library and Viper4Android module

@Vimal Vinz for the V4A DDC + Kernel + profiles