yashsingh1/xdaforums huggingface dataset:
[OnePlus 5T  Themes, Apps, and Mods] firedroidx:
Unfortunately, this module doesn't work on the latest OOS open beta on 9.0. Just found this mod and I'm excited to try it out once it's working! Don't have any other mods on my phone besides magisk. :good:
[OnePlus 5T  Themes, Apps, and Mods] freyrnygaard:
I am on the latest OOS beta too and it's not working. Merry Christmas by the way for everyone!
[OnePlus 5T  Themes, Apps, and Mods] ADDICTED777:
People looking for strereo mod on pie oos or custom head over here :

https://xdaforums.com/oneplus-5/themes/stereo-speaker-mod-oos-t3632980/page43

Don't say thanks to me.... Do it with the button....
[OnePlus 5T  Themes, Apps, and Mods] konsolite:
Hi everyone,

I've prepared new edition Dual Speaker mode for OOS One Plus 5T. It was tested with latest beta 22 and works alongside with Dolby Digital Plus and Viper.

Feel free to comment.

Greetings to osm0sis and everybody who helped and tested previous edition dual speaker mod.
[OnePlus 5T  Themes, Apps, and Mods] Mervingio:
so assume can be used with Magisk 18 without issue? :cool:
[OnePlus 5T  Themes, Apps, and Mods] konsolite:
I've used latest Magisk template from branch: Magisk Module Template 17000. Installed in Magisk 18 without issue at my 5T.
[OnePlus 5T  Themes, Apps, and Mods] Amanpreetsingh:
How to install dolby and viper in 5t on Android pie.
[OnePlus 5T  Themes, Apps, and Mods] Ritwik Rahman:
Can you pls provide link for Dolby Digital Plus! ?

And i don't find any difference after flashing the zip... AML is installed also...
[OnePlus 5T  Themes, Apps, and Mods] Klbgr:
https://xdaforums.com/android/software/mm-p-dolby-digital-plus-arise-20181115-t3868192/page18
[OnePlus 5T  Themes, Apps, and Mods] estate:
After installing Dolby , my camera results always busy... Disabling in magisk and camera work again.

Anyone else?

Inviato dal mio ONEPLUS A5010 utilizzando Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] Klbgr:
Have you installed camera lib fix ? This may be the problem, camera lib fix and audio mod aren't compatible on stock kernel
[OnePlus 5T  Themes, Apps, and Mods] estate:
I'll try disabling lib! What kernel did you recommend?

Inviato dal mio ONEPLUS A5010 utilizzando Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] Klbgr:
I don't know lol
[OnePlus 5T  Themes, Apps, and Mods] estate:
Anyway,also with custom kernel, I've to disable lib for camera working...

Inviato dal mio ONEPLUS A5010 utilizzando Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] 03031002:
some new version for magisk v18.1?
[OnePlus 5T  Themes, Apps, and Mods] Pawer8:
I flashed it successfully but there's no app to control it
[OnePlus 5T  Themes, Apps, and Mods] wahing:
maybe this link will help you

https://xdaforums.com/showpost.php?p=75285158&postcount=2050
[OnePlus 5T  Themes, Apps, and Mods] artur_ba:
Working on OSS Pie (9.0.5) & Magisk 19, but has no control app

EDIT: not working microphone during a phone call
[OnePlus 5T  Themes, Apps, and Mods] Merovingio:
This module still working on stable 9.0.7 guys?
[OnePlus 5T  Themes, Apps, and Mods] R Forrester:
None of the versions posted here have worked for me. Using OOS 4.7.6 magisk 19.3.
[OnePlus 5T  Themes, Apps, and Mods] Ritwik Rahman:
Magisik Module doesn't work with Android 10 Q (Custom Roms)
[OnePlus 5T  Themes, Apps, and Mods] DorianX:
Should work for 5T too

https://xdaforums.com/showthread.php?p=81447119

Enviado desde mi ONEPLUS A5000 mediante Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] Ritwik Rahman:
Finally a update to my Favorite Module! Is it Stereo or Mono?
[OnePlus 5T  Themes, Apps, and Mods] DorianX:
Unfortunately it's just dual mono

Enviado desde mi ONEPLUS A5000 mediante Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] R Forrester:
I can't seem to get this working. Running Oreo with latest Magisk and Viper. Is there a version/process that works or do I need to bite the bullet and upgrade to Pie?
[OnePlus 5T  Themes, Apps, and Mods] g_turc:
Hi guys, what do I have to do to make this mod work? I got Viper already installed and my OP5T runs OOS 9.0.10. Can I just flash it via Magisk?

Thanks
[OnePlus 5T  Themes, Apps, and Mods] DorianX:
Install Audio Modification Library https://xdaforums.com/apps/magisk/mod-audio-modification-library-t3745466

Enviado desde mi ONEPLUS A5000 mediante Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] R Forrester:
I do actually have that installed. Neither the TWRP version nor the Magisk versions seem to work.
[OnePlus 5T  Themes, Apps, and Mods] DorianX:
Install this version:

Then install AML, if you have AML installed it will get uninstalled, reboot, then install it again. All this on magisk

Enviado desde mi ONEPLUS A5000 mediante Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] R Forrester:
Thanks for the link, that version worked, but somehow I have it working with Viper without AML installed. I have Viper set to compatibility mode whether that makes a difference.
[OnePlus 5T  Themes, Apps, and Mods] mobde3:
Should it work in Android 10 OOS ?
[OnePlus 5T  Themes, Apps, and Mods] AleksiT:
Did u get it to work on android 10?:confused:
[OnePlus 5T  Themes, Apps, and Mods] DorianX:
Working fine hereView attachment 5066753

Enviado desde mi ONEPLUS A5000 mediante Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] Iyer_yash21:
How to increase the output and which app should i use to control the output. By output i mean loudness and what is the safe setting for that. I'm running OOS 10 with bluspark kernel. I can't find any setting in fkm to control Audio. Thanks in advance.?

Edit: Dug a bit and found a v2 boosted zip. I think that's what I need.
[OnePlus 5T  Themes, Apps, and Mods] zeeshanonlyme:
Does it work for you without breaking the mic?
[OnePlus 5T  Themes, Apps, and Mods] Iyer_yash21:
Works without any problems for me.
[OnePlus 5T  Themes, Apps, and Mods] zeeshanonlyme:
Do you also use viper or any other audio mod?
[OnePlus 5T  Themes, Apps, and Mods] Iyer_yash21:
No just the dual speaker mod. No Audio mods or AML
[OnePlus 5T  Themes, Apps, and Mods] KaptanHarlock:
İs it possible to use on Android 10 ?
[OnePlus 5T  Themes, Apps, and Mods] joji1990:
Guys, I downlaoded the. Bin files but when I go to magisk and click on install from storage, the file manager doesn't recognise the downloaded file as a installer pkg. Can anyone help
[OnePlus 5T  Themes, Apps, and Mods] DrGreem:
Try flashing with twrp.
[OnePlus 5T  Themes, Apps, and Mods] winter62:
Waiting for useable at custom rom (pixel extended).
[OnePlus 5T  Themes, Apps, and Mods] i6rb:
+1
[OnePlus 5T  Themes, Apps, and Mods] Lossyx:
Just disable/uninstall the module from Magisk Manager.
[OnePlus 5T  Themes, Apps, and Mods] Ramme:
i use FreedomOS 7.1.1 oos4.7.4, FrankenKernalR16, Magisk v15.1

i installed only Viper4Android sound mod.

if i install Stereo Mod via TWRP, how can i remove it if i dont likt it ? > Thats was my question?
[OnePlus 5T  Themes, Apps, and Mods] fuarkgl3:
I didn't test. I don't remember if calls were working nice, i guess yes but telegram you can't record a voice note
[OnePlus 5T  Themes, Apps, and Mods] i6rb:
i flash it via TWRP

Nothing to do with Magisk Manager
[OnePlus 5T  Themes, Apps, and Mods] Lossyx:
It's still a Magisk module. (Assuming you flashed zip from OP)
[OnePlus 5T  Themes, Apps, and Mods] Mythos123:
How safe is this mod? Can it damage the earpiece?

By the power of OnePlus 5T.
[OnePlus 5T  Themes, Apps, and Mods] paatha13:
Well with Magisk 15.1 being successful installed via twrp with 4.7.6 Oxygen.

Works great!!

Previous attempts with SuperSu being unsuccessful via twrp.
[OnePlus 5T  Themes, Apps, and Mods] surpra:
You can uninstall it from magisk under modules
[OnePlus 5T  Themes, Apps, and Mods] Lossyx:
Does this mod work for you with Viper4Android installed?
[OnePlus 5T  Themes, Apps, and Mods] surpra:
Yes it works absolutely fine :) but do note the stereo mod as it is increases the sound output from the speaker noticibely.so I'd suggest to keep the master off for phone speaker setting in viper.
[OnePlus 5T  Themes, Apps, and Mods] max0901:
Hello !

I've sent a request to OnePlus to add stereo in an OTA, they said that it was a good idea and that they will talk to the developpers, I hope that it will work (even if I'm pretty sure that we'll never get it officially). (I can't root or change my phone's rom or whatever because I need apps that don't work with it - snap, bank, NFC paiement etc..)

Max
[OnePlus 5T  Themes, Apps, and Mods] xocomaox:
You can root with Magisk and it will pass SafteyNet check and work with all those apps. Just FYI if you're still thinking of installing this mod.
[OnePlus 5T  Themes, Apps, and Mods] max0901:
Oh ok thank you, but.. I'm sorry.. what does FYI means ?
[OnePlus 5T  Themes, Apps, and Mods] dynamic_4444:
For Your Information ?
[OnePlus 5T  Themes, Apps, and Mods] xocomaox:
This mod actually requires Magisk to flash anyways.
[OnePlus 5T  Themes, Apps, and Mods] TankTan38:
I'm on OmniROM 8.1. It didn't let me flash via Magisk, but TWRP seemed to succeed. However, I don't hear any sound out of the earpiece. I do have Viper installed via Magisk. Any know what's going on here?
[OnePlus 5T  Themes, Apps, and Mods] andrizmitnick:
what magisk viper version did u install? you may try remove viper and stereo module first, and install stereo mod then viper again
[OnePlus 5T  Themes, Apps, and Mods] kxf41:
Anybody have this working on the Oreo beta with magisk 15.2? It won't install for me via magisk or twrp, says installation failed - magisk not installed, I have no other soundmods installed, fresh clean install of Oreo beta yesterday even wiped internal storage too.
[OnePlus 5T  Themes, Apps, and Mods] ankushgautam:
Can the earpiece be damaged by this in long run? Anyone using it on their older phones like op3 or 3t?
[OnePlus 5T  Themes, Apps, and Mods] martinez5241:
+1 agreed
[OnePlus 5T  Themes, Apps, and Mods] Fignoleur:
Flashed via twrp... All good on omnirom 8.1

Thanks
[OnePlus 5T  Themes, Apps, and Mods] martinez5241:
Brain fart... Thanks. Should of just done that from the beginning....
[OnePlus 5T  Themes, Apps, and Mods] Hemanthse7en:
Not working on open beta 1 oreo... Any suggestions...

No audio mod installed...
[OnePlus 5T  Themes, Apps, and Mods] hardspartan360:
I'm on Ob1 and it's working. Using Magisk 15.2 and the mod flashed in TWRP.

Great work!!
[OnePlus 5T  Themes, Apps, and Mods] Simo Moky:
Beta Oreo 1 works perfectly, flash via TWRP, but unfortunately many times audio does not work for phone calls
[OnePlus 5T  Themes, Apps, and Mods] cd993:
Oreo beta 1 and whilst outbound earpiece audi works, inbound received calls earpiece audio does not work. Uninstalled via Magisk, rebooted and back to normal now
[OnePlus 5T  Themes, Apps, and Mods] andrizmitnick:
*updated*

i already add oreo OOS version in the first page
[OnePlus 5T  Themes, Apps, and Mods] Simo Moky:
Perfect work!

Phone call OK!

Spotify OK!

YouTube OK!

Play Music (or another music player) nope ?

however, both thanks for the work done ?
[OnePlus 5T  Themes, Apps, and Mods] matrix.bharath:
This doesn't work on ringtone? I don't head stereo when I get a call on the ringtone
[OnePlus 5T  Themes, Apps, and Mods] kxf41:
I'm back on stock 4.7.6 now, magisk 15.2 installed and few modules working fine and my root apps have root access, but I still have the same "magisk not installed" error when I try to install this mod, via magisk and blu spark twrp 8.61.

So frustrating.......

Edit - Just installed a Dolby Atmos module via mm no problems.
[OnePlus 5T  Themes, Apps, and Mods] Groh1234:
Oxygen 4.7.6, magisk 15.2. Mod don't istalled!
[OnePlus 5T  Themes, Apps, and Mods] boonthongw@gmail.com:
Try flash by twrp. Mine is working well in 4.7.6
[OnePlus 5T  Themes, Apps, and Mods] MrPhilo:
Some apps won't record voice (Telegram and Whatsapp) and some app don't use the earpierce. I am using Stock 4.7.6 with Blu Kernel.
[OnePlus 5T  Themes, Apps, and Mods] nightraving:
Don't think it's available for 15.2 yet as I had the same problem. Unless anybody knows if this has changed yet?

Edit: flash from TWRP. It's been updated for 15.2 but doesn't work if you flash in magisk
[OnePlus 5T  Themes, Apps, and Mods] kxf41:
Ok thanks, it installed ok now via twrp, but my happiness was short lived because even though it's showing as installed and activated in magisk I have no sound from the ear piece :confused:
[OnePlus 5T  Themes, Apps, and Mods] nightraving:
Yep, I'm having the same problem. Can anybody shed some light on this?
[OnePlus 5T  Themes, Apps, and Mods] xocomaox:
I tried searching a lot of the other threads but couldn't find the actual lines in the XML which correspond to the earpiece volume and gain. I want to start it off at 50% of full and increment from there. So that having the lowest volume setting produces a somewhat loud earpiece volume.
[OnePlus 5T  Themes, Apps, and Mods] WSZR:
It does not work with me. Through MM and TWRP.
[OnePlus 5T  Themes, Apps, and Mods] AK1149:
5T doesn't have Marshmallow. What device are you using?
[OnePlus 5T  Themes, Apps, and Mods] Brentboy:
He probably meant magisk manager. He's having trouble installing it.
[OnePlus 5T  Themes, Apps, and Mods] WSZR:
MM - magisk manager

I have OP5T 8GB RAM with OOS 4.7.6, Magisk 15.2 and TWRP 3.2.1.1

---------- Post added at 06:29 AM ---------- Previous post was at 06:26 AM ----------

I still have the same "magisk not installed" error when I try to install this mod, via Magisk Manager and TWRP.
[OnePlus 5T  Themes, Apps, and Mods] kxf41:
MM = Magisk Manager
[OnePlus 5T  Themes, Apps, and Mods] Lossyx:
Bad magisk installation. Uninstall and reinstall magisk.
[OnePlus 5T  Themes, Apps, and Mods] WSZR:
Other modules working.
[OnePlus 5T  Themes, Apps, and Mods] Groh1234:
i don't using other modules on magisk.
[OnePlus 5T  Themes, Apps, and Mods] WSZR:
I use ViPER4Android and Volume Steps Increase.
[OnePlus 5T  Themes, Apps, and Mods] the Doctor:
Today I'm on Omni weeklies, Magisk 15.3. The mod had to be flashed in TWRP. It works great (using it now with MX Player), except that at higher volume levels the top speaker gets completely drowned out by the bottom firing speaker, obviously a result of the physical design differences between of the two speakers.
[OnePlus 5T  Themes, Apps, and Mods] ONeVmaniac:
Well it doesn't work for me on open beta 1. Magisk installation shows the magisk error and after TWRP flash MX player or any other player won't "trigger" the secondary speaker. Any ideas what is going on?

Wysłane z mojego ONEPLUS A5010 przy użyciu Tapatalka
[OnePlus 5T  Themes, Apps, and Mods] Meherbanali:
I am on stock OOS BETA will it work on it?
[OnePlus 5T  Themes, Apps, and Mods] prologikus:
For people like me whos getting "magisk not activated",

here i modded this mod to work with magisk v15+

E:Updated magisk module name
[OnePlus 5T  Themes, Apps, and Mods] genevois26:
Magisk show me that it's for OP3T but the module works. It's normal?

Enviado desde mi ONEPLUS A5010 mediante Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] prologikus:
The original zip was from an op3, i just replacred the file from system(which enables stereo speakers) with the one from this mod

Download the file again, i updated the text from magisk
[OnePlus 5T  Themes, Apps, and Mods] genevois26:
I can't download the new one. Check it. Thanks

Enviado desde mi ONEPLUS A5010 mediante Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] osm0sis:
Seems to work with some apps (e.g. YouTube), but not others (e.g. Play Music).
[OnePlus 5T  Themes, Apps, and Mods] prologikus:
It works for me at least now
[OnePlus 5T  Themes, Apps, and Mods] WSZR:
This version has installed, but there is no change. Why?
[OnePlus 5T  Themes, Apps, and Mods] prologikus:
I don't understand what are you trying to say...
[OnePlus 5T  Themes, Apps, and Mods] KOLIOSIS:
Try it out on different apps :

One other user besides myself have found that,at the moment, it isn't working with every app.

For instance, I'm on Open Beta 2 & it works on YouTube videos, but, isn't working with Google Play Music.

You may have different results with another ROM.
[OnePlus 5T  Themes, Apps, and Mods] DorianX:
Using this mod + Viper4Android from here: https://xdaforums.com/showthread.php?t=3577058 makes"stereo" effect work on every single app at least for my OP5

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[OnePlus 5T  Themes, Apps, and Mods] osm0sis:
Please upload your /vendor/etc/mixer_paths_tasha.xml from when you're booted to Android (i.e. not in recovery). It might work for all of us. :good:
[OnePlus 5T  Themes, Apps, and Mods] DorianX:
My /vendor/etc/mixer_paths_tasha.xml is the same after installing V4A so the trick is maybe on this system.props:

tunnel.decode=false
lpa.use-stagefright=false
lpa.releaselock=false
lpa.decode=false

Or maybe because SELinux is set to permissive

Or this changes to audioserver and mediaserver:

set_sepolicy audioserver audioserver_tmpfs file read,write,execute
set_sepolicy audioserver system_file file execmod
set_sepolicy mediaserver mediaserver_tmpfs file read,write,execute
set_sepolicy mediaserver system_file file execmod
set_sepolicy audioserver unlabeled file read,write,open,getattr,execute

Don't know but try that V4A Module and check, I tried playing music/videos on all this apps: Google Play Music, Spotify, Deezer, VLC player, Sony Music, Piktures and the "stereo" effect works on all.

Some times V4A stop working (not FC or similar, just stop working when you have a lot without playing music/videos) but this workaround makes it works again:

- Open V4A

- Tap on superior right dots and exit

- Tap on multitask button and swipe V4A to close it

- Open V4A again

Enviado desde mi ONEPLUS A5000 mediante Tapatalk
[OnePlus 5T  Themes, Apps, and Mods] jiovaxrs:
Exelent mod

Any way to revert to stock? Via .zip
[OnePlus 5T  Themes, Apps, and Mods] Meuuks13:
Hi mod is working but how do I disable it
[OnePlus 5T  Themes, Apps, and Mods] andrizmitnick:
i already try to look into this, but no luck, doesn't have any clue xD maybe other ppl can help lookin' into this

you can easily do that from Magisk Manager
[OnePlus 5T  Themes, Apps, and Mods] osm0sis:
I just checked how the Nexus 5X mod (which has full stereo in all apps) works, and it does the following in mixer_paths.xml..

Replaces:

<path name="speaker">
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="SLIM_0_RX Channels" value="One" />
<ctl name="RX7 MIX1 INP1" value="RX1" />
<path name="speaker-gain-default" />
<ctl name="COMP0 Switch" value="1" />
</path>

With:

<path name="speaker">
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="SLIM RX2 MUX" value="AIF1_PB" />
<ctl name="SLIM_0_RX Channels" value="Two" />
<ctl name="RX7 MIX1 INP1" value="RX1" />
<ctl name="RX1 MIX1 INP1" value="RX2" />
<ctl name="CLASS_H_DSM MUX" value="DSM_HPHL_RX1" />
<ctl name="DAC1 Switch" value="1" />

<ctl name="COMP0 Switch" value="1" />
<ctl name="HPHL DAC Switch" value="1" />
<ctl name="RX1 Digital Volume" value="89" />
<ctl name="RX7 Digital Volume" value="86" />
</path>

I know we're looking at some pretty drastically different hardware so there might not be much overlap but <ctl name="SLIM_0_RX Channels" value="One" /> also appears in your modded tasha.xml and so I was wondering what switching it from One to Two might do.

Maybe [MENTION=5108383]sshafranko[/MENTION] or [MENTION=1346563]CazeW[/MENTION] who created/maintain the N5X mod might be able to help more. :fingers-crossed:
[OnePlus 5T  Themes, Apps, and Mods] CazeW:
Unfortunately I only took what [MENTION=2760454]chdloc[/MENTION], [MENTION=5108383]sshafranko[/MENTION] and [MENTION=5940484]Jose-MXL[/MENTION] created and put them all in single zip, so I don't have that much knowledge of all those values. Those guys are the real heroes who might be able to help with this.
[OnePlus 5T  Themes, Apps, and Mods] chdloc:
I have not read through this thread, but one of the issues I'm suspecting is that the OP 5T has a separate speaker DAC/amplifier. This makes stereo playback more difficult to achieve than on the N5X and other older devices.

However, I've succeed in doing so for the Pixel (XL), but it involved quite some mixer editing as well as direct speaker DAC/amp register manipulation for true stereo playback to work.

Post the relevant and current mixer file as well as the output of the following shell command (run as root)

find /sys/module -name 'snd_*'

and I'll see what I can do.
[OnePlus 5T  Themes, Apps, and Mods] osm0sis:
Here's the unmodified OP5T mixer_paths, and here's the output. Thanks for looking into it!

/sys/module/snd_soc_wcd9335
/sys/module/snd_soc_wcd934x
/sys/module/snd_soc_wcd9xxx
/sys/module/snd_usb_audio
/sys/module/snd_timer
/sys/module/snd_soc_wsa881x
/sys/module/snd_pcm
/sys/module/snd_soc_msm_stub
/sys/module/snd_soc_tfa98xx
/sys/module/snd_soc_wcd_mbhc

There are a number of other mixer_paths_*.xml files as well, but this is the one the current mod uses. Let me know if you want to check out any of the others.
[OnePlus 5T  Themes, Apps, and Mods] ozyk100:
Is there any chance to get this mod for few of us that rooted with SuperSu (I really don't have luck with mm)? And revert.zip would be really nice!

OOS 4.7.6 unlocked bootloader and SuperSu root

Thank You OP in advance either way!
[OnePlus 5T  Themes, Apps, and Mods] chdloc:
What does the following command (executed as root) return?

find /sys/kernel/debug/tfa98*/ -name '*'

If the current mod does anything, then that's all I need.
[OnePlus 5T  Themes, Apps, and Mods] osm0sis:
/sys/kernel/debug/tfa9891-36/
/sys/kernel/debug/tfa9891-36/regs
/sys/kernel/debug/tfa9891-36/regs/25-MISC_CTRL
/sys/kernel/debug/tfa9891-36/regs/22-CTRL_SAAM_PGA
/sys/kernel/debug/tfa9891-36/regs/13-PDM_DS4_L
/sys/kernel/debug/tfa9891-36/regs/12-PDM_DS4_R
/sys/kernel/debug/tfa9891-36/regs/11-PDM_OUT_CTRL
/sys/kernel/debug/tfa9891-36/regs/10-PDM_CTRL
/sys/kernel/debug/tfa9891-36/regs/0F-INTERRUPT_REG
/sys/kernel/debug/tfa9891-36/regs/0B-HIDDEN_MTP_KEY2
/sys/kernel/debug/tfa9891-36/regs/0A-I2S_SEL_REG
/sys/kernel/debug/tfa9891-36/regs/09-SYS_CTRL
/sys/kernel/debug/tfa9891-36/regs/08-SPKR_CALIBRATION
/sys/kernel/debug/tfa9891-36/regs/07-DCDCBOOST
/sys/kernel/debug/tfa9891-36/regs/06-AUDIO_CTR
/sys/kernel/debug/tfa9891-36/regs/05-BAT_PROT
/sys/kernel/debug/tfa9891-36/regs/04-I2SREG
/sys/kernel/debug/tfa9891-36/regs/03-REVISIONNUMBER
/sys/kernel/debug/tfa9891-36/regs/02-TEMPERATURE
/sys/kernel/debug/tfa9891-36/regs/01-BATTERYVOLTAGE
/sys/kernel/debug/tfa9891-36/regs/00-STATUS
/sys/kernel/debug/tfa9891-36/accounting
/sys/kernel/debug/tfa9891-36/dsp-state
/sys/kernel/debug/tfa9891-36/version
/sys/kernel/debug/tfa9891-36/R
/sys/kernel/debug/tfa9891-36/calibrate
/sys/kernel/debug/tfa9891-36/TEMP
/sys/kernel/debug/tfa9891-36/MTPEX
/sys/kernel/debug/tfa9891-36/OTC

Thanks again for looking into it.

The current mod does enable stereo but it's only in certain apps, so tasha it is! :)
[OnePlus 5T  Themes, Apps, and Mods] chdloc:
Try the attached mixer. The (substantial) modifications are heavily borrowed from my Pixel mod. I marked all modifications with "chdloc"

Since the functionality appears to be so similar I'm also attaching a Tasker-generated app with which the stereo feature can be controlled: a permanent notification with which you can toggle between mono (well, actual dual-loudspeaker playback with the earpiece about 18 dB quieter) and true stereo playback (earpiece is on the left and the main speaker is on the right). Note that the earpiece speaker is not able to produce the same SPL as the main loudspeaker. Hence, in true stereo mode, the overall volume is very low to avoid earpiece distortions (main loudspeaker is attenuated to match the maximum volume the earpiece is able to put out) , but should be sufficient if you play games or consume media by yourself in a reasonably quiet environment.

Note that since I do not have a OP5T, I cannot test it, and this is very alpha. I'm sure you know what you are doing, but others on this thread may not know what to do if the phone is stuck in a boot loop due to a botched mixer. Be warned.

To install, copy the attached mixer to /vendor/etc, rename to mixer_paths_tasha.xml, set permissions to 644 (rw-r--r--), install the apk (if you wish), reboot, and issue a quick prayer...;)