Instructions for USB Sound Card on Android


        
            
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            ADB Commands for USB Sound Card/DAC Installations.
You will have to connect your screen to a Wifi source, and a computer to the same Wifi source. Obtain the IP from Settings -> Wifi -> YOUR WIFI NAME -> Advanced -> IP Address
adb connect IP:5555

adb root

adb disable-verity

adb reboot
adb connect IP:5555

adb root

adb remount

adb pull /system/build.prop
Edit your build.prop using Notepad++, then paste this at the very bottom.
# Safe Media Bypass for External USB Sound Cards
audio.safemedia.bypass=true
This allows the Safe Media Bypass warning adjustment to disable resetting your volume from 100% to 30% when your screen reboots
Push your modified build.prop back into the device
adb push build.prop /storage/emulated/0/

adb shell

mv /storage/emulated/0/build.prop /system/build.prop

chmod 644 /system/build.prop

reboot