[Galaxy S 4 Active Android Development] wilsonhlacerda:
Hi all I9295 users and [MENTION=4425076]_JaSoN_[/MENTION] ! A little bit late but here it is! An audio mod that I've done. File is attached with README and everything.

JaSon, if you think it is fine feel free to replace current mixer_paths.xml with it for all your next releases.

Better than write everything again, I'll just leave here a copy of the README file itself:

Hi all!

Just a small mod that both me and my girlfriend using on ours S4 Active i9295 with LOS14.1 (it was built taking releases of late 2018 and 2019 as a basis).

Hope you enjoy!

You'll get:

- dual audio (back and front speakers, but not stereo)

- dual microphone (bottom and top)

- increased volume (speakers, headphone)

- increased sensitivity (device and head microphones)

- some fixes

TO INSTALL the easy way:

copy to device the attached ZIP Audio-IncreaseDualSpk_IncreaseBothMic_Fix.zip

reboot to recovery TWRP

flash ZIP as usual (ZIP is not signed)

reboot

now can delete the ZIP

everytime you update ROM you have to do that again!

TO INSTALL the hard way: (not that hard! ;) )

with root privilegies, go to /system/etc

there you'll see the file mixer_paths.xml ==> copy it elsewhere as a backup if desired

copy the modded mixer_paths.xml (inside of ZIP) to /system/etc

check mixer_paths.xml permissions: be sure it is 644 as expected

reboot

everytime you update ROM you have to do all that again!

That is it!

Also attached you'll find some other files that I explain bellow:

mixer_paths-LOS14.1_20190408-untouched.xml

The original mixer_paths.xml file that came with LOS14.1 released 2019 april 08

If you want to revert the mod just rename it and do as in "TO INSTALL the hard way". Or dirty flash your whole LOS14.1 ROM again.

mixer_paths-CM14.1_20170102-untouched.xml

This was the original mixer_paths.xml of CM14.1 and then LOS14.1 at the very begining of 2017, before any kind of mod.

mixer_paths-LOS2017-1stTopMicWrong-byMasteroftech.xml

This was the first mod done by user masteroftech in 2017/feb. Its intention was to increase microphone sensitivity, but was not good (increased top microphone)

mixer_paths-LOS2017-2ndBottomMic-byMasteroftech.xml

This was the second mod done by user masteroftech in 2017/feb. Its intention was to increase microphone sensitivity, now done to bottom microphone and better.

mixer_paths-LOS2017-BothMic-byTsvetkov_vlad.xml

This was a mod done by user tsvetkov_vlad in 2017/feb. It took the second masteroftech's mod as a basis and improved it by implementing dual microphone. This has been the basis for all mixer_paths.xml of LOS14.1 releases till now.

mixer_paths-LOS2019-IncreaseDualSpk_IncreaseBothMic_Fix-byWilsonhlacerda.xml

Same of mixer_paths.xml inside the ZIP. I (user wilsonhlacerda) took the current 2019 mixer_path.xml as a basis and improved it by reviewing/increasing volume and sensitivity, adding dual audio and doing some fixes.

If you want to inspect in detail what has been changed from one file to the other, just use any diff / compare tool. The mixer_paths.xml is a regular text file. For instance on Windows you can download the great Notepad++ and add the plug-in Compare to it.