[Galaxy Tab 4 Original Android Development] Achsel:
As others have already reported, the MindTheGapps-11.0.0-arm-20210412_124103.zip file apparantly can’t be installed with TWRP (mount error). I installed the open_gapps-arm-11.0-pico-20210130-TEST.zip instead.

https://sourceforge.net/projects/opengapps/files/arm/test/20210130/

Today I made a new installation and installed the BiTGApps-arm-11.0.0-R28_signed.zip with TWRP (22 MB smaller than open_gapps-arm-11.0-pico-20210130-TEST.zip).

https://www.pling.com/p/1462973/

As already reported in the thread on version 17.1, the automatic detection and switching to a connected USB DAC does not work with my SM-T530 and the DAC’s GGMM A1 and SABRENT even with version 18.1. With 17.1 you could manually switch the audio output to USB DAC and back to internal speakers using the LesserAudioSwitch app. With 18.1 (Android 11) the app no longer works, if you install it normally. Android 11 requires a permission for audio routing. Here my solution, if you have root by Magisk. Download the "LesserAudioSwitch.zip" file from here:

https://androidfilehost.com/?a=show&w=files&flid=319752

After extraction the ZIP file you get the "Lesser AudioSwitch 2.6.0.apk" (free, but 2 Options locked) and a "privapp_lesser.xml file". Copy the "Lesser AudioSwitch 2.6.0.apk" (set the permissions to "rw-r--r--") via Root Explorer into the folder "/system/priv-app/" in a new subfolder "LesserAudioSwitch" (set the permissions to "rwxr-xr-x") and the file "privapp_lesser.xml" file into the folder "/system/etc/permissions/" (set the permissions to "rw-r--r--"). Then you have to restart the device and "Lesser AudioSwitch 2.6.0.apk" will automatically installed as system app.

Go to "Settings/Apps & Notifications/Show all (xx) apps/Lesser AudioSwitch/Storage and cache/", then "Wipe cache" and "Wipe storage" and "OK". Click onto "Back"-Button, "Force quit" and "Deactivate".

Download this modified version "Lesser AudioSwitch 2.5.0" (both options unlocked) from here:

https://www.happymod.com/lesser-aud...r-audioswitch-mod-apk-v2-5-0-downloading.html

Go to "/system/priv-app/LesserAudioSwitch" and delete via "Root Explorer" the "LesserAudioSwitch2.6.0.apk" file and copy the "Lesser AudioSwitch 2.5.0 mod.apk" (set the permissions to "rw-r--r--") into this folder. Restart your device again. The "Lesser AudioSwitch 2.5.0 mod.apk" file will automatically installed as system app. Go to "Settings/Apps & Notifications/Show all (xx) apps/Lesser AudioSwitch/" and tip on "Activate".

Now the app works like with android 10 and with both free options "RESTORE ON BOOT" and "AUTO". You may have to reinstall the app after an update of LineageOS. Important: Don’t enable "MagiskHide" for this app in the "Settings" of "Magisk" (click onto "shield" symbol, "MagiskHide", "Show system apps" and "Show all installed apps", only enable: "Google Play Store" and "Google Play Services")!

Go to "Quick start window", click onto "pencil" symbol for editing, drag the icons "USB DAC", "Speakers", "Headphones" and "Bluetooth" into the "Quick start window" for faster change of the audio output.

Good luck installing!

@matteo0026: Thank you for LinageOS 18.1 on a 7 year old SM-T530!

Great job!

Greetings from Axel!